参数资料
型号: S5933QE
厂商: APPLIEDMICRO INC
元件分类: 总线控制器
英文描述: PCI BUS CONTROLLER, PQFP160
封装: PLASTIC, QFP-160
文件页数: 145/176页
文件大小: 823K
代理商: S5933QE
3-80
ADD-ON BUS OPERATION REGISTERS
S5933
ADD-ON CONTROLLED BUS MASTER
WRITE TRANSFER COUNT REGISTER
(MWTC)
Register Name:
Master Write Transfer Count
Add-On Address Offset: 58h
Power-up value:
00000000h
Attribute:
Read/Write
Size:
32 bits
This register is only accessible when Add-On initiated
bus mastering is enabled.
The master write transfer count register is used to
convey to the S5933 controller the actual number of
bytes that are to be transferred. The value in this
register is decremented with each bus master PCI
write operation until the transfer count reaches zero.
Upon reaching zero, the transfer operation ceases
and an interrupt may be optionally generated to ei-
ther the PCI or Add-On bus interface. Transfers
which are not whole multiples of DWORDs in size
result in a partial word ending cycle. This partial word
ending cycle is possible since all bus master trans-
fers for this controller are required to begin on a
DWORD boundary.
31
0
25
Bit
Value
Transfer Count
in Bytes (R/W)
Reserved = O's (RO)
26
00
Figure 6. Add-On Controlled Bus Master Write Transfer Count Register
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