參數(shù)資料
型號: OR3LP26B
英文描述: Field-Programmable System Chip (FPSC) Embedded Master/Target PCI Interface
中文描述: 現(xiàn)場可編程系統(tǒng)芯片(促進文化基金)嵌入式主/目標PCI接口
文件頁數(shù): 43/184頁
文件大?。?/td> 5590K
代理商: OR3LP26B
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Lucent Technologies Inc.
Lucent Technologies Inc.
43
Data Sheet
March 2000
ORCAOR3LP26B FPSC
Embedded Master/Target PCI Interface
PCI Bus Core Detailed Description Dual
Port
(continued)
Master Read Byte Enables
During master reads, byte enables are always supplied
by the Master to the Target, even though on reads the
data is flowing in the opposite direction. Thus, the byte
enables cannot be buffered in a FIFO alongside the
corresponding data. Also, the byte enables must be
presented on the bus by the Master at the same time
that the data is being presented on the bus by the Tar-
get (unless the Target uses
trdyn
to insert wait-states),
and so the data provided by the Target cannot depend
on the byte enables (once again, without wait-states).
Termination
Once initiated, Master read operations will repeat on
the PCI bus until either one of the following occurs:
1. All data is received.
2. An abort occurs (either Master or Target).
3. The
fpga_mstopburstn
signal is asserted.
4. The PCI bus’ reset signal (
rstn
) is asserted.
If a PCI transaction is terminated with a retry or discon-
nect before all data has been received, the PCI core
will initiate another Master read operation, continuing
from that point.
Reset
The FPGA application can apply the PCI core’s reset
signal
mfifoclrn
to place the core’s master logic in a
known state. Normally, the clear signal will not be used
unless a severe problem has occurred in the data flow.
The
mfifoclrn
signal is synchronous with
fclk
and must
be asserted for a minimum of three clock periods. Dur-
ing reset, the
m_ready
signal will go low. After the
reset signal is deasserted high,
m_ready
will continue
to be low for 8—10 clock periods. The FPGA applica-
tion should not continue normal operation until
m_ready
is asserted high.
Understanding and Using the pci_mcfg_stat Status
Signals
On the Master interface, there are two signals that con-
trol and provide status to the FPGA application. The
signal
pci_mcfg_stat
provides the status, and
mcfg-
shiftenn
controls what information the status line pro-
vides. The
pci_mcfg_stat
signal is always active and
duplicates the status contained in configuration status
register at location offset 0x04, bits 24, 28, and 29. To
use this status output, the FPGA application must keep
mcfgshiftenn
= 1. When high,
pci_mcfg_stat
pro-
vides the wired-OR of the three status lines. If
pci_mcfg_stat
gets set to a 1, indicating an error, then
the FPGA application may set
mcfgshiftenn
= 0 to
determine individual status. Once low, the
pci_mcfg_stat
signal will output data parity error
detected on the first clock, target abort received on the
second clock, and master abort received on the third
clock.
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