參數(shù)資料
型號: PCI1620PDV
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): 78/164頁
文件大?。?/td> 720K
代理商: PCI1620PDV
4
10
4.18 CardBus Latency Timer Register
The CardBus latency timer register is programmed by the host system to specify the latency timer for the PCI1620
CardBus interface, in units of CCLK cycles. When the PCI1620 is a CardBus initiator and asserts CFRAME, the
CardBus latency timer begins counting. If the latency timer expires before the PCI1620 transaction has terminated,
then the PCI1620 terminates the transaction at the end of the next data phase. A recommended minimum value for
this register of 20h allows most transactions to be completed.
Bit
7
6
5
4
3
2
1
0
Name
CardBus latency timer
Type
RW
RW
RW
RW
RW
RW
RW
RW
Default
0
0
0
0
0
0
0
0
Register:
Offset:
Type:
Default:
CardBus latency timer
1Bh (Functions 0, 1)
Read/Write
00h
4.19 CardBus Memory Base Registers 0, 1
These registers indicate the lower address of a PCI memory address range. They are used by the PCI1620 to
determine when to forward a memory transaction to the CardBus bus, and likewise, when to forward a CardBus cycle
to PCI. Bits 31
12 of these registers are read/write and allow the memory base to be located anywhere in the 32-bit
PCI memory space on 4-Kbyte boundaries. Bits 11
0 are read-only and always return 0s. Writes to these bits have
no effect. Bits 8 and 9 of the bridge control register (offset 3Eh, see Section 4.25) specify whether memory windows
0 and 1 are prefetchable or nonprefetchable. The memory base register or the memory limit register must be nonzero
in order for the PCI1620 to claim any memory transactions through CardBus memory windows (i.e., these windows
by default are not enabled to pass the first 4 Kbytes of memory to CardBus).
Bit
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
Name
Memory base registers 0, 1
Type
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
Default
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Bit
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Name
Memory base registers 0, 1
Type
RW
RW
RW
RW
R
R
R
R
R
R
R
R
R
R
R
R
Default
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Register:
Offset:
Type:
Default:
Memory base registers 0, 1
1Ch, 24h
Read-only, Read/Write
0000 0000h
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