參數(shù)資料
型號： 82803AAMRH-R
英文描述： Controller Miscellaneous - Datasheet Reference
中文描述： 控制器雜項-數(shù)據(jù)表參考
文件頁數(shù)： 32/52頁
文件大小： 322K
代理商： 82803AAMRH-R
82803AA MRH-R
R
Datasheet
32
Table 2. Expansion Bus Serial Packet Field Definitions
Field
Description
xSOP[3:0]
Expansion Serial Op-code (ExSOP):
Specifies command for control register operations.
Encodings not listed are reserved.
0000 - SRD:
Serial read of control register specified in xSA[11:0]. The read could be either
from MRH-R specified by xC[4:0] or from the RDRAM device on ‘stick’
channel specified by previous RNC command.
0001 - SWR:
Serial write of control register specified in xSA[11:0]. The write could be
either to MRH-R specified by xC[4:0] or to the RDRAM device on ‘stick’
channel specified by previous RNC command.
0010 - SETR:
Set reset bit in the MRH-R specified by xC[4:0] or set reset bit in the RDRAM
device specified by the previous RNC command. This command is ignored
by the MRH-R and is treated as a NOP.
0100 - SETF:
Set Fast Clock bit in the MRH-R specified by xC[4:0] or set Fast Clock bit in
the RDRAM device specified by the previous RNC command. This command
is ignored by the MRH-R and is treated as a NOP.
1000 - RNC:
Route the next ExSOP command to the ‘stick channel specified by xC[4:0].
1001 - RSIO:
Perform SIO Reset sequence on the ‘stick’ channel specified by xC[4:0].
1011 – CLRR:
Clear reset bit in MRH-R specified by xC[4:0] clear reset bit in RDRAM
device specified by the previous RNC command. This command is ignored
by the MRH-R and is treated as a NOP.
1101 - SPDW: Write Byte to SPD EEPROM specified by xC[4:0], xSA[7:0] and xSD[7:0].
The xC[4:0] specifies the MRH-R associated with the SPD EEPROM. The
xSA[7:0] contains the slave address, xSD[157:0] contains the byte address
and xXD[15:8] contains the data to be written to the SPD EEPROM.
1110 - SPDR: Random Read the SPD EEPROM specified by xC[4:0], xSA[7:0] and
xSD[7:0]. The xC[4:0] specifies the MRH-R associated with the SPD
EEPROM. The xSA[7:0] contains the slave address and xSD[7:0] contains
the byte address. The Random read operation consists of two transactions
on the SMBUS. The first transaction is a write to the SPD EEPROM and the
second transaction is a read from the SPD EEPROM. The data read from the
EEPROM is placed in the SPDRDR register. Bit 15 of this register indicates
whether the data contained in bit[7:0] is valid or not.
xSBC
Expansion Serial Broadcast
xC[4:0]
Expansion Buffer Serial Address:
Compared to bits [4:0] of the INIT control register to select
the MRH-R that the expansion serial transaction is directed. Compared to bits [4:0] of the INIT
control register to select the RDRAM channel to which the associated serial transaction is
directed.
xSA[11:0]
Expansion Serial Register Address:
xSA[11:0] selects which control register of the selected
MRH-R is read or written. xSA[7:0] specifies the slave address for SPDR and SPDW xSOP
commands.
xSD[15:0]
Expansion Serial Data:
The 16 bits of data read from or written to the selected control register
in the selected MRH-R. The xSD[7:0] specifies the byte address for SPDR and SPDW
commands. The xSD[15:8] specifies the write data for SPDW command.
The following sections detail the available packet formats and the operations that can be performed on
the serial control bus (CMOS interface).
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