diff --git a/.gitignore b/.gitignore
index c64ba14..a32a598 100644
--- a/.gitignore
+++ b/.gitignore
@@ -4,3 +4,4 @@ node_modules
 package-lock.json
 index.js
 *.tgz
+pdfs
diff --git a/bin/duh-bus.js b/bin/duh-bus.js
index 8d5623e..03e8c93 100755
--- a/bin/duh-bus.js
+++ b/bin/duh-bus.js
@@ -1,9 +1,25 @@
 #!/usr/bin/env node
 'use strict';
 
+const process = require('process');
 const path = require('path');
+const { program } = require('commander');
+const dl = require('../lib/amba-pdf-dl.js');
 
-const specPath = path.resolve(__dirname, '../specs');
+const main = async () => {
+  program
+    .option('--amba-pdf-dl <folder>', 'download AMBA spec PDFs')
+    .parse(process.argv);
+
+  const opts = program.opts();
+  if (opts.ambaPdfDl) {
+    await dl(opts.ambaPdfDl);
+    return;
+  }
+  const specPath = path.resolve(__dirname, '../specs');
+  console.log(specPath);
+};
+
+main();
 
-console.log(specPath);
 /* eslint no-console:0 */
diff --git a/lib/amba-pdf-dl.js b/lib/amba-pdf-dl.js
new file mode 100644
index 0000000..df5e60c
--- /dev/null
+++ b/lib/amba-pdf-dl.js
@@ -0,0 +1,38 @@
+'use strict';
+
+const { createWriteStream, existsSync } = require('fs');
+const { mkdir } = require("fs/promises");
+const path = require('path');
+const { Readable } = require('stream');
+const { finished } = require('stream/promises');
+
+const specs = require('./amba-specs.js');
+
+const dl = async (ambaSpecsDl) => {
+  const dlFolderPath = path.resolve('.', ambaSpecsDl);
+  if (!existsSync(dlFolderPath)) {
+    await mkdir(dlFolderPath);
+  }
+  for (const spec of specs) {
+    const url = `https://documentation-service.arm.com/static/${spec.id}?token=`;
+    const res = await fetch(url);
+    const headers = res.headers.entries();
+    let fileName;
+    for (const [key, val] of headers) {
+      if (key === 'content-disposition') {
+        const m = val.match(/^attachment; filename=(?<baseName>[\w_-]+).pdf$/);
+        fileName = m.groups.baseName + '.pdf';
+      }
+    }
+    const fullFileName = path.resolve('.', dlFolderPath, fileName);
+    if (!existsSync(fullFileName)) {
+      const fileStream = createWriteStream(fullFileName, { flags: 'wx'});
+      await finished(Readable.fromWeb(res.body).pipe(fileStream));
+      console.log(fileName + ' - downloded');
+    } else {
+      console.log(fileName + ' - exists');
+    }
+  }
+};
+
+module.exports = dl;
diff --git a/lib/amba-specs.js b/lib/amba-specs.js
new file mode 100644
index 0000000..28f59b0
--- /dev/null
+++ b/lib/amba-specs.js
@@ -0,0 +1,55 @@
+'use strict';
+
+const ids = [
+  // {id: '????????????????????????', amba: 2, protocol: 'APB2',       rev: 'A',    docid: 'IHI0011A',    name: 'IHI0011A'},
+  {id: '64257d8379edab6d64fb6f68', amba: 3, protocol: 'APB3',       rev: 'B',    docid: 'IHI0024b',    name: 'IHI0024b'},
+  {id: '64257f64314e245d086bc8b7', amba: 4, protocol: 'APB4',       rev: 'C',    docid: 'IHI0024C',    name: 'IHI0024C_amba_apb_protocol_v2_0_spec'},
+  {id: '60d5b505677cf7536a55c245', amba: 5, protocol: 'APB5',       rev: 'D',    docid: 'IHI0024D',    name: 'IHI0024D_amba_apb_protocol_spec'},
+  {id: '63fe2c1356ea36189d4e79f3', amba: 5, protocol: 'APB5',       rev: 'E',    docid: 'IHI0024E',    name: 'IHI0024E_amba_apb_architecture_spec'},
+  {id: '64258237314e245d086bc8c6', amba: 3, protocol: 'AHB-Lite',   rev: 'A',    docid: 'IHI0033a',    name: 'IHI0033a'},
+  {id: '5f91607cf86e16515cdc3b4b', amba: 5, protocol: 'AHB',        rev: 'B.b',  docid: 'IHI0033B_B',  name: 'IHI0033B_B_amba_5_ahb_protocol_spec'},
+  {id: '6141bf0d674a052ae36ca811', amba: 5, protocol: 'AHB',        rev: 'C',    docid: 'IHI0033C',    name: 'IHI0033C_amba_ahb_protocol_spec'},
+  {id: '5f915920f86e16515cdc3342', amba: 3, protocol: 'AXI',        rev: 'B',    docid: 'IHI0022B',    name: 'AMBAaxi'},
+  {id: '64256e84314e245d086bc88f', amba: 3, protocol: 'AXI',        rev: 'C',    docid: 'IHI0022C',    name: 'IHI0022C_amba_axi_v2_0_protocol_spec'},
+  {id: '64256ff4314e245d086bc893', amba: 4, protocol: 'AXI',        rev: 'D',    docid: 'IHI0022D',    name: 'IHI0022D_amba_axi_protocol_spec'},
+  {id: '6425706579edab6d64fb6f54', amba: 4, protocol: 'AXI',        rev: 'E',    docid: 'IHI0022E',    name: 'IHI0022E_amba_axi_and_ace_protocol_spec'},
+  {id: '5f915bbcf86e16515cdc3b23', amba: 5, protocol: 'AXI',        rev: 'F.b',  docid: 'IHI0022F_b',  name: 'IHI0022F_b_amba_axi_protocol_spec'},
+  {id: '5f915905f86e16515cdc333b', amba: 5, protocol: 'AXI',        rev: 'G',    docid: 'IHI0022G',    name: 'IHI0022G_amba_axi_protocol_spec'},
+  {id: '5f915965f86e16515cdc339c', amba: 5, protocol: 'AXI',        rev: 'H',    docid: 'IHI0022H',    name: 'IHI0022H_amba_axi_protocol_spec'},
+  {id: '602a9df190ee6824a1e02b98', amba: 5, protocol: 'AXI',        rev: 'H.c',  docid: 'IHI0022H_c',  name: 'IHI0022H_c_amba_axi_protocol_spec'},
+  {id: '63ff0ebd56ea36189d4e7ee7', amba: 5, protocol: 'AXI',        rev: 'J',    docid: 'IHI0022J',    name: 'IHI0022J_amba_axi_protocol_spec'},
+  {id: '651c285c15583d1bff972f94', amba: 5, protocol: 'AXI',        rev: 'K',    docid: 'IHI0022K',    name: 'IHI0022K_amba_axi_protocol_spec'},
+  {id: '642583d7314e245d086bc8c9', amba: 4, protocol: 'AXI-Stream', rev: 'A',    docid: 'IHI0051A',    name: 'IHI0051A_amba4_axi4_stream_v1_0_protocol_spec'},
+  {id: '64819f1516f0f201aa6b963c', amba: 5, protocol: 'AXI-Stream', rev: 'B',    docid: 'IHI0051B',    name: 'IHI0051B_amba_axi_stream_protocol_spec'},
+  {id: '5f914e1cf86e16515cdc2b3b', amba: 5, protocol: 'CHI',        rev: 'B',    docid: 'IHI0050B',    name: 'amba_5_chi_architecture_specification_IHI0050B'},
+  {id: '5f914e9bf86e16515cdc2b47', amba: 5, protocol: 'CHI',        rev: 'C',    docid: 'IHI0050C',    name: 'IHI0050C_amba_5_chi_architecture_spec'},
+  {id: '5f914ecbf86e16515cdc2b4d', amba: 5, protocol: 'CHI',        rev: 'D',    docid: 'IHI0050D',    name: 'IHI0050D_amba_5_chi_architecture_spec'},
+  {id: '6087f99b5e70d934bc69f1f0', amba: 5, protocol: 'CHI',        rev: 'E.a',  docid: 'IHI0050E_a',  name: 'IHI0050E_a_amba_5_chi_architecture_spec'},
+  {id: '6295e03db334256d9ea8ae86', amba: 5, protocol: 'CHI',        rev: 'E.b',  docid: 'IHI0050E_b',  name: 'IHI0050E_b_amba_chi_architecture_spec'},
+  {id: '63341ee5da191e7fe057d04b', amba: 5, protocol: 'CHI',        rev: 'E.c',  docid: 'IHI0050E_c',  name: 'IHI0050E_c_amba_chi_architecture_spec'},
+  {id: '65a69276b52744113be6343b', amba: 5, protocol: 'CHI',        rev: 'F',    docid: 'IHI0050F',    name: 'IHI0050F_amba_chi_architecture_spec'},
+  {id: '65e83256837c4d065f65591d', amba: 5, protocol: 'CHI',        rev: 'F.b',  docid: 'IHI0050F_b',  name: 'IHI0050F_b_amba_chi_architecture_spec'},
+  {id: '65e836aaa97073311e216fb9', amba: 5, protocol: 'CHI',        rev: 'G',    docid: 'IHI0050G',    name: 'IHI0050G_amba_chi_architecture_spec'},
+  {id: '5f915d9ff86e16515cdc3b30', amba: 5, protocol: 'GFB',        rev: 'A',    docid: 'IHI0083A',    name: 'IHI0083A_amba_generic_flash_bus_architecture_specification'},
+  {id: '6294e5a131ea212bb662277e', amba: 5, protocol: 'GFB',        rev: 'A.b',  docid: 'IHI0083A_b',  name: 'IHI0083A_b_amba_generic_flash_bus_protocol_specification'},
+  {id: '5f914f6ef86e16515cdc2b62', amba: 5, protocol: 'ATP',        rev: 'A',    docid: 'IHI0082A',    name: 'IHI0082A_amba_adaptive_traffic_profiles_specification'},
+  {id: '5f915e4ef86e16515cdc3b37', amba: 5, protocol: 'LPI',        rev: 'B',    docid: 'IHI0068B',    name: 'IHI0068B_low_power_interface_spec'},
+  {id: '5f915e69f86e16515cdc3b3e', amba: 5, protocol: 'LPI',        rev: 'C',    docid: 'IHI0068C',    name: 'IHI0068C_low_power_interface_spec'},
+  {id: '617a637283e60c5c768e2241', amba: 5, protocol: 'LPI',        rev: 'D',    docid: 'IHI0068D',    name: 'IHI0068D_amba_low_power_interface_spec'},
+  {id: '6425805779edab6d64fb6f72', amba: 3, protocol: 'ATB',        rev: 'A',    docid: 'IHI0032A',    name: 'IHI0032a'},
+  {id: '5fb7ec16d77dd807b9a80cb6', amba: 4, protocol: 'ATB',        rev: 'B',    docid: 'IHI0032B',    name: 'IHI0032B_amba_atb_protocol_spec'},
+  {id: '61b0bea883e60c5c768e4c6a', amba: 5, protocol: 'ATB',        rev: 'C',    docid: 'IHI0032C',    name: 'IHI0032C_amba_atb_protocol_spec'},
+  {id: '5fc5124e6620e02e2b67ebb4', amba: 5, protocol: 'LTI',        rev: 'A',    docid: 'IHI0089A',    name: 'IHI0089A_amba_lti'},
+  {id: '611131bd3d73a34b640e33ff', amba: 5, protocol: 'LTI',        rev: 'A.b',  docid: 'IHI0089A_b',  name: 'IHI0089A_b_amba_lti_protocol_spec'},
+  {id: '651d2bd515583d1bff973037', amba: 5, protocol: 'LTI',        rev: 'B',    docid: 'IHI0089B',    name: 'IHI0089B_amba_lti_protocol_spec'},
+  {id: '60ddf202677cf7536a55cd55', amba: 5, protocol: 'DTI',        rev: 'E',    docid: 'IHI0088E',    name: 'IHI0088E_amba_dti_protocol_spec'},
+  {id: '60ddf3840320e92fa40b6010', amba: 5, protocol: 'DTI',        rev: 'E.b',  docid: 'IHI0088E_b',  name: 'IHI0088E_b_amba_dti_protocol_spec'},
+  {id: '65e83b84a97073311e216fc1', amba: 5, protocol: 'DTI',        rev: 'E.c',  docid: 'IHI0088E_c',  name: 'IHI0088E_c_amba_dti_protocol_spec'},
+  {id: '65ef05752caafd7dd7a386d6', amba: 5, protocol: 'DTI',        rev: 'F',    docid: 'IHI0088F',    name: 'IHI0088F_amba_dti_protocol_spec'},
+  {id: '5f915d17f86e16515cdc3b2a', amba: 5, protocol: 'CXS',        rev: 'A',    docid: 'IHI0079A',    name: 'IHI0079A_amba_cxs_protocol_spec-2'},
+  {id: '60002aa43f22832ff1d6871b', amba: 5, protocol: 'CXS',        rev: 'B',    docid: 'IHI0079B',    name: 'IHI0079B_amba_cxs_streaming_protocol_spec'},
+  {id: '656d9b43c31bbd744e645613', amba: 5, protocol: 'CXS',        rev: 'C',    docid: 'IHI0079C',    name: 'IHI0079C_amba_cxs_streaming_protocol_spec'},
+  {id: '65cb95b0c2052a35156cea71', amba: 5, protocol: 'CHI-C2C',    rev: 'A',    docid: 'IHI0098A',    name: 'IHI0098A_amba_chi_c2c_architecture_spec'},
+];
+
+module.exports = ids;
diff --git a/package.json b/package.json
index 50e6fba..dfe4f79 100644
--- a/package.json
+++ b/package.json
@@ -41,6 +41,7 @@
     "nyc": "^15.1.0"
   },
   "dependencies": {
+    "commander": "^12.1.0",
     "json5": "^2.2.3"
   }
 }