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C&H Technologies M218 User Manual

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3.2.2 Module Identification

The M218 supports the identification function called IDENT. This IDENT function provides

information about the module and is stored in a sixteen-word deep (32 byte) serial PROM.

Access is accomplished with read/write operations on the last address in IOSpace (hex FE) and

the data is read one bit at a time. The PROM is compatible with a standard IC 9603 type PROM.

For specific timing information refer to the 9603 or compatible PROM data sheet. Data should

not be written to the PROM.

The module also supports the VXI-IDENT function. This function is not

part of the approved

ANSI/VITA 12-1996 standard. This extension to the M-module IDENT function increases the

size of the PROM to 64 words and includes VXI compatible ID and Device Type Registers.

Details are shown in Table III.

Table III. M/MA Module PROM IDENT Words

Word Description Value (hex)

0 Sync Code 5346

1 Module Number 0686

2 Revision Number

1

0001

3 Module Characteristics

2

0868

4-7 Reserved 0000

8-15 M-Module Specific 0000

16 VXI Sync Code ACBA

17 VXI ID 0FFF

3

18 VXI Device Type

3

F25B (M218)

19-31 Reserved 0000

32-63 M-Module Specific 0000

Notes:

1) The Revision Number is the functional revision level of the module. It does not necessarily correspond

to the hardware assembly level.

2) The Module Characteristics bit definitions are:

Bit(s)

Description

15 0 = no burst access

14/13 unused

12 0 = does not need 12V

11 1 = needs +5V

10 0 = no trigger outputs

9 0 = no trigger inputs

8/7 00 = no DMA requestor

6/5 11 = interrupt type

4/3 01 = 16-bit data

2/1 00 = 8-bit address

0 0 = no memory access

3) The VXI ID of 0xFFF is the identification value for Hewlett-Packard. C&H has left the ID equal to

this value to allow operation with existing E2270A software drivers. The revision number (see note 1)

can be used to identify the module as manufactured by C&H.

4) The VXI Device Type word contains the following information:

Bit(s)

Description

15-12 F

16

= 256 bytes of required memory

11-0 260

16

= C&H specified VXI model code for M218

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