CH Tech M222 user manual Table III. M/MA Module Prom Ident Words, Vxi Id

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3.2.2 Module Identification

The M222 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	068A
2	Revision Number 1	0002
3	Module Characteristics 2	1868
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	F25F
19-31	Reserved	0000
32-63	M-Module Specific	0000

Notes:

1)A Revision Number greater than 1 indicates that the module was manufactured by C&H Technologies.

2)The Module Characteristics bit definitions are:

Bit(s) Description

150 = no burst access

14/13 unused

120 = needs ±12V

111 = needs +5V

100 = 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 E2274A 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 F16 = 256 bytes of required memory

11-0 25F16 = C&H specified VXI model code for M222

10