5

MCECC

The possible states of the bits after local, software, and power-up reset are as defined below.

PThe bit is affected by power-up reset.

LThe bit is affected by local reset.

SThe bit is affected by software reset. (Writing $0F to the Chip ID Register)

XThe bit is not affected by reset.

VThe effect of reset on this bit is variable.

A summary of the first eight CSR registers (the ones that correspond to those found in the MEMC040) is shown in Table 5-2, following. Note that even though there are two sets of these registers, one for the lower MCECC and one for the upper MCECC, software should only perform read and write cycles to the control and status registers in the upper MCECC. Hardware takes care of duplicating the information to the lower MCECC. The following descriptions show the upper MCECC bit positions. Upper MCECC bit positions 31-24 correspond to lower MCECC bit positions 15-

8.The base address of the CSRs is hard coded to the address $FFF43000 for the MCECC pair on the first mezzanine board and $FFF43100 for the MCECC pair on the second mezzanine board.

Table 5-2. MCECC Internal Register Memory Map, Part 1

MCECC Base Address = $FFF43000 (1st); $FFF43100 (2nd)

 

Register

 

 

 

Register Bit Names

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Offset

 

Name

D31

D30

D29

D28

D27

 

D26

D25

D24

 

 

 

 

 

 

 

 

 

 

 

 

$00

 

CHIP ID

CID7

CID6

CID5

CID4

CID3

 

CID2

CID1

CID0

 

 

 

 

 

 

 

 

 

 

 

 

$04

 

CHIP

REV7

REV6

REV5

REV47

REV3

 

REV2

REV1

REV0

 

 

REVISION

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

$08

 

MEMORY

0

0

FSTRD

1

0

 

MSIZ2

MSIZ1

MSIZ0

 

 

CONFIG

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

$0C

 

DUMMY 0

0

0

0

0

0

 

0

0

0

 

 

 

 

 

 

 

 

 

 

 

 

5-10

Computer Group Literature Center Web Site

Page 300
Image 300
Motorola MVME172 Mcecc Internal Register Memory Map, Part, Mcecc Base Address = $FFF43000 1st $FFF43100 2nd, Offset Name