ibm3206k0424 ETC-unknow, ibm3206k0424 Datasheet - Page 239

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

Preliminary
8.1: BCACH Control Register
The bits in this register control the various functions provided by the cache logic. See Note on Set/Clear Type
Registers on page 93 for more details on addressing.
Length
Type
Address
Power On Value
Restrictions
pnr25.chapt04.01
August 14, 2000
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
26
Retry Delayed Accesses
BCACH Diagnostic Mode
Flush Cache Line 3
Flush Cache Line 2
Enable Caching Packet Memory
Reads
Enable Caching Packet Memory
Writes
Function
32 bits
Clear/Set
XXXX 1000 and 004
X’2000 0000’
None
When this bit is set, reads of Packet Memory will be cached.
When this bit is set, writes to Packet Memory will be cached.
When this bit is set, and the cache is enabled, any access of Packet Memory that cannot
be satisfied within one cycle will be terminated by the cache with a retry indication. The
accessing device is expected to allow competing devices a chance to gain access to the
bus and then retry the same operation.
When this bit is set, diagnostic mode is enabled and reads and writes of the BCACH
array from the processor are enabled. When reset, reads from the processor will return
X’BADDBADD’ and writes will have no affect. Care must be taken when performing
writes from the processor: if a cache line fill operation is in process and a write is per-
formed from the processor that writes to the same address in the array as is being written
from the fill operation, results are indeterminate.
Setting this bit forces a flush of cache line 3 if it is dirty. This bit is reset by the hardware
when the flush completes.
Setting this bit forces a flush of cache line 2 if it is dirty. This bit is reset by the hardware
when the flush completes.
Predictive Fill Threshold
Description
IBM Processor for Network Resources
The Bus DRAM Cache Controller (BCACH)
9
8
7
Timed Flush Time Out Value
6
5
4
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IBM3206K0424
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