ibm3206k0424 ETC-unknow, ibm3206k0424 Datasheet - Page 186

• Manufacturer Part Number: ibm3206k0424
• Description: Ibm Processor For Network Resources
• Manufacturer: ETC-unknow

IBM3206K0424
IBM Processor for Network Resources
5.1: COMET/PAKIT Control Register
This register contains the information that controls the functions of the entity. See Note on Set/Clear Type
Registers on page 93 for more details on addressing. Before this register can be altered, writing it must be
enabled in COMET/PAKIT Memory Controller Write Enable Register (described on page 197).
Length
Type
COMET Address
PAKIT Address
Power On Value
Restrictions
The DRAM Controllers (COMET/PAKIT)
Page 186 of 676
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10
Bit(s)
31
30
29
28
27
Disable Controller Waiting for
T
charge
Reserved
4/2 Bank SDRAM Device
Reserved
Encode SRAM Chip Selects
RAS
Being Met on Auto Pre-
Function
32 bits
Read/Write
XXXX 0900 AND 04
XXXX 0980 AND 84
X’00000000’
None
Some SDRAM modules don’t allow sending a read or write with auto precharge to them
unless T
part that allows sending an auto precharge before T
be set. This bit has no meaning for SRAM.
Reserved
When this bit is ‘1’, the SDRAMs attached are four-bank devices. When a ‘0’, the
SDRAMs are two-bank devices. A ‘0’ setting works for either type device, but four-bank
devices provide slightly better performance if this bit is set to ’1’.
Reserved
When using SRAM, this bit set to a ‘0’ causes the chip select outputs to be direct chip
selects. Set to ’1’, chip selects 2-0 carry an encoded value for one of eight chip selects.
Chip select three indicates when chip selects 2-0 are valid.
RAS
has been met. If using ESDRAM (any SDRAM at burst length of two, or a
Description
9
8
RAS
7
has been met), this bit should
6
5
4
pnr25.chapt04.01
August 14, 2000
3
Preliminary
2
1
0