ARM Technical Support Knowledge Articles

Which schematic diagram should I use on the Versatile CD?

Applies to: Versatile Baseboards, Versatile Core Tiles, Versatile Logic Tiles

Answer

[Updated 26 September 2007]

The Versatile family CD-ROM supplies schematic diagrams for some development boards of the Versatile family. Note that PCB data (including schematics) is not provided for the latest development boards of the Versatile Family (PB1176, PB11MPCore, PB-A8, PBX-A9, CT-R4F, and LT-XC5VLX330).

Traditionally there was a single PDF for each revision of PCB released.  This CD (v3.1.1 and later) now has a different file naming convention that has a generic schematic (named <board number and PCB revision>_coredesign.pdf), this is not used for Bill of Materials (BoM) generation - the actual PCB builds (BoMs and schematics) are provided with a letter such as '_a' or '_b' to denote build variants where applicable.

Taking the AB926EJ-S as an example, rev C schematics are provided with the new naming convention (shown in bold text):

 hpi0118a.pdf Diagram for the rev A PCB
 hpi0118b.pdf Diagram for the rev B PCB
 hpi0118c_coredesign.pdf Generic diagram for the rev C PCB - for all boards, ignore this PDF
 hpi0118c_a.pdf Build variant 'a' for the rev C PCB
 hpi0118c_b.pdf Build variant 'b' for the rev C PCB

Which build variant is my board?

The variant letter of a PCB should be marked on the board itself, either handwritten in indelible marker pen, or with a printed sticker. This marking should be in or on a small white rectangle which is part of the silk screen printing, immediately after the PCB part number. The following photograph shows the location on a RevC, build variant A CT1156T2F-S board:

Photograph of PCB build variant marking on CT1156T2F-S

It has been found that some boards have the build variant letter incorrectly marked on the PCB. In this case, it is not possible to read the build variant letter from the PCB itself and the information below should be used for correct identification.

What are the differences between the build variants?

The details of the build variants of the Versatile boards are shown below (correct as of December 2006).

AB926EJ-S
 Variant 'a' is the standard build
 Variant 'b' is fitted with taller expansion connectors (J17,J18,J25,J26) - limited release

AT1
 Variant 'a' is the standard build

CT7TDMI
 Variant 'a' is fitted with ARM7TDMI r3a (Epson) - check printed info on the test chip
 Variant 'b' is fitted with ARM7TDMI r3a (Hynix) - check printed info on the test chip
 Variant 'c' is fitted with ARM7TDMI r4 (Epson) - check printed info on the test chip

 CT11MPCore
  Variant 'a' is fitted with a test chip socket - not released
  Variant 'b' is the standard build

 CT1156
  Variant 'a' is the standard build
  Variant 'b' is for a future Core Tile - ignore

CT_GTC
 Variant 'e' is fitted with a test chip socket - not released
 Variant 'h' is fitted with ARM1136JF-S r0p1 (TSMC)
 Variant 'j' is fitted with ARM926EJ-1616 r0p4 (UMC)

EB
 Variant 'a' is the standard build

LT_XC4VLXnn0
 Variant 'a' is fitted with an XC4VLX100 FPGA - not released
 Variant 'b' is fitted with an XC4VLX160 FPGA
 Variant 'c' is fitted with an XC4VLX200 FPGA

PB926EJ-S
 Variant 'a' is the standard build
 Variant 'b' is for production test only - not released.

PCI Backplane
 Variant 'a' is the standard build
 Variant 'b' is for production test only - not released.

Attachments: img18630.jpg

Article last edited on: 2011-01-10 12:01:55

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