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: 134/176页
文件大小: 823K
代理商: S5933QE
3-70
ADD-ON BUS OPERATION REGISTERS
S5933
ADD-ON PASS-THRU ADDRESS
REGISTER (APTA)
Register Name:
Add-On Pass-Thru Address
Add-On Address Offset: 28h
Power-up value:
XXXXXXXXh
Attribute:
Read Only
Size:
32 bits
This register is employed when a response is desired
when one of the Base address decode regions is
selected during an active PCI bus cycle. When one of
the base address decode registers 1-4 encounters a
PCI bus cycle which selects the region defined by it,
this device latches that current cycle’s active address
and asserts the signal PTATN# (Pass-Thru Atten-
tion). Wait states are generated on the PCI bus until
either data is transferred or the PCI bus cycle is
aborted by the initiator.
This register provides a method for “live” data (regis-
tered) transfers. Intended uses include the emulating
of other hardware as well as enabling the connection
of existing external hardware to interface to the PCI
bus through the S5933.
ADD-ON PASS-THRU DATA
REGISTER (APTD)
Register Name:
Add-On Pass-Thru Data
Add-On Address Offset: 2Ch
Power-up value:
XXXXXXXXh
Attribute:
Read/Write
Size:
32 bits
This register, along with APTA described above, is
employed when a response is desired should one of
the Base address decode regions become selected
during an active PCI bus cycle. When one of the
base address decode registers 1-4 encounters a PCI
bus cycle which selects the region defined by it, the
APTA register will contain that current cycle’s active
address and the device asserts the signal PTATN#
(Pass-Thru ATentioN). Wait states are generated on
the PCI bus until this register is read (PCI bus writes)
or this register is written (PCI bus reads).
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