參數(shù)資料
型號: S5933QE
廠商: APPLIEDMICRO INC
元件分類: 總線控制器
英文描述: PCI BUS CONTROLLER, PQFP160
封裝: PLASTIC, QFP-160
文件頁數(shù): 120/176頁
文件大?。?/td> 823K
代理商: S5933QE
3-57
PCI BUS OPERATION REGISTERS
S5933
MAILBOX EMPTY FULL/STATUS
REGISTER (MBEF)
Register Name:
Mailbox Empty/Full Status
PCI 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 is displayed on the low-order 16
bits and the empty/full status for the Incoming mail-
boxes is presented on the high-order 16 bits. A value
of 1 signifies that a given mailbox has been written by
one bus interface but has not yet been read by the
corresponding destination interface. A PCI bus in-
coming mailbox is defined as one in which data trav-
els from the Add-On bus into the PCI bus, and an
outgoing mailbox is defined as one where data trav-
els out from the PCI bus to the Add-On interface.
31
0
15
Bit
Value
Outgoing Mailbox
Status (RO)
Incoming Mailbox
Status (RO)
16
Figure 5. Mailbox Empty/Full Status Register
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