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: 136/176页
文件大小: 823K
代理商: S5933QE
3-72
ADD-ON BUS OPERATION REGISTERS
S5933
ADD-ON EMPTY/FULL STATUS
REGISTER (AMBEF)
Register Name:
Add-On Mailbox Empty/Full
Status
Add-On Address Offset: 34h
Power-up value:
00000000h
Attribute:
Read Only
Size:
32 bits
This register provides empty/full visibility of each byte
within the mailboxes. The empty/full status for the
Outgoing mailboxes are displayed on the high order
16 bits and the empty/full status for the incoming
mailboxes are presented on the low order 16 bits. A
value of one signifies that a given mailbox had been
written by the sourcing interface but had not yet been
read by the corresponding destination interface. An
incoming mailbox is defined as one in which data
travels from the PCI bus into the Add-On bus and an
outgoing mailbox is defined as one where data goes
OUT from the Add-On bus to the PCI interface.
Figure 3. Add-On Mailbox Empty/Full Status Register
31
0
15
Bit
Value
Incoming Mailbox
Status (RO)
Outgoing Mailbox
Status (RO)
16
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