參數(shù)資料
型號(hào): S5935TFC
廠商: APPLIEDMICRO INC
元件分類: 總線控制器
英文描述: PCI Product
中文描述: PCI BUS CONTROLLER, PQFP208
封裝: TQFP-208
文件頁(yè)數(shù): 126/204頁(yè)
文件大小: 1897K
代理商: S5935TFC
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S5935 – PCI Product
126 DS1527
AMCC Confidential and Proprietary
Revision 1.02 – June 27, 2006
Data Book
MAILBOX OVERVIEW
The S5935 has eight 32-bit mailbox registers. The
mailboxes are useful for passing command and status
information between the Add-On and the PCI bus. The
PCI interface has four incoming mailboxes (Add-On to
PCI) and four outgoing mailboxes (PCI to Add-On).
The Add-On interface has four incoming mailboxes
(PCI to Add-On) and four outgoing mailboxes (Add-On
to PCI). The PCI incoming and Add-On outgoing mail-
boxes are the same, internally. The Add-On incoming
and PCI outgoing mailboxes are also the same,
internally.
The mailbox status may be monitored in two ways.
The PCI and Add-On interfaces each have a mailbox
status register to indicate the empty/full status of bytes
within the mailboxes. The mailboxes may also be con-
figured to generate interrupts to the PCI and/or Add-
On interface. One outgoing and one incoming mailbox
on each interface can be configured to generate
interrupts.
FUNCTIONAL DESCRIPTION
Figure 1 shows a block diagram of the PCI to Add-On
mailbox registers. Add-On incoming mailbox read
accesses pass through an output interlock latch. This
prevents a PCI bus write to a PCI outgoing mailbox
from corrupting data being read by the Add-On. Figure
2 shows a block diagram of the Add-On to PCI mailbox
registers. PCI incoming mailbox reads also pass
through an interlocking mechanism. This prevents an
Add-On write to an outgoing mailbox from corrupting
data being read by the PCI bus. The following sections
describe the mailbox flag functionality and the mailbox
interrupt capabilities.
Figure 70. Block Diagram - PCI to Add-On Mailbox Register
Figure 71. Block Diagram - Add-On to PCI Mailbox Register
MAILBOX
REGISTER
ADD-ON
BUS
"INCOMING
MAILBOX"
SELECT
OUTPUT
INTERLOCK
LATCH
OUTPUT
DRIVER
ADD-ON
BUS
"INCOMING MAILBOX"
MAILBOX
FULL
S
Q
D
"O"
LOAD ENABLE
READ ENABLE
EN
EN
ADD-ON
RD#
SELECT#
EMPTY/FULL FF
Q
D
Q
D
PCI BUS
"OUTGOING MAILBOX"
SELECTED READ ENABLE
P
A
MAILBOX
REGISTER
PCI
"INCOMING
MAILBOX"
SELECT
OUTPUT
INTERLOCK
LATCH
ADD-ON
BUS
"OUTGOING
MAILBOX"
WR#
SELECT#
PCI BUS
"INCOMING MAILBOX"
REGISTER
DECODE OF
ADR[6:2]
BE[3:0]#
MAILBOX
FULL
"O"
PCI READ PULSE
EMPTY/FULL FF
ADD-ON WRITE PULSE
SELECTED
READ PULSE
EN
Q
S
D
QD
QD
P
A
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