PM7340 S/UNI-IMA-8
PRELIMINARY
INVERSE MULTIPLEXING OVER ATM
DATA SHEET
PMC-2001723
ISSUE 3
INVERSE MULTIPLEXING OVER ATM
Register 0x046: SDRAM DIAG Indirect Burst Ram Data LSB
Bit
Type
Function
Default
15:0
R/W
BR_DATA_LSB
0
This register should not be written while the BR_BUSY bit is set in the SDRAM
Burst RAM Indirect Access register.
BR_DATA_LSB:
The BR_DATA_LSB represents either: (1) the least significant 16 bits of the
data to be written to internal memory or (2) the least significant 16 bits of the
read data resulting from the previous read operation. The read data is not
valid until after the BR_BUSY bit has been cleared.
Register 0x048: SDRAM DIAG Indirect Burst RAM Data MSB
Bit
Type
Function
Default
15:0
R/W
BR_DATA_MSB
0
This register should not be written while the BR_BUSY bit is set in the SDRAM
Burst RAM Indirect Access register.
BR_DATA_MSB:
The BR_DATA_MSB represents either: (1) the most significant 16 bits of the
data to be written to internal memory or (2) the most significant 16 bits of the
read data resulting from the previous read operation. The read data is not
valid until after the BR_BUSY bit has been cleared.
The following explains the Burst RAM accessed by the indirect access.
Burst RAM: The microprocessor has access to the external SDRAM for
diagnostic testing. There is a 64-byte cell buffer for writing to the external
SDRAM and a 64-byte cell buffer for storing data read from the external SDRAM.
Figure 24 shows the format of the cell in the Burst RAM.
Figure 24
-Burst RAM Format
Word # 31 Bits
0
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE
121
PMC [ PMC-SIERRA, INC ]
