參數(shù)資料
型號： PLI9080
廠商： Electronic Theatre Controls, Inc.
英文描述： PCI I/O ACCELERATOR
中文描述： 的PCI I / O加速器
文件頁數(shù)： 34/133頁
文件大小： 883K
代理商： PLI9080
SECTION 3
PCI 9080
FUNCTIONAL DESCRIPTION
PLX Technology, Inc., 1997
Page 26
Version 0.93
3.6.3.2 PCI to Local Bus DMA Transfer
Local Bus Arbitration:
PCI Bus Arbitration:
Releases control of the PCI bus
whenever the FIFO becomes full,
terminal count is reached, the PCI
latency timer expires and PCI GRANT
de-asserts, a PCI Disconnect is received,
or a Direct Local to PCI request is
pending.
Rearbitrates for control of the PCI bus
when the preprogrammed number of
empty entries in the FIFO becomes
available, or after two PCI clocks if a
disconnect was received.
PCI
Arbitration
Local Bus
Arbitration
FIFO
Load FIFO with
PCI Bus
Read Cycles
Unload FIFO with
Local Bus
Write Cycles
Local Interrupt Generation
(Programmable)
Done
Chaining: Terminal
Count for Current
Descriptor
PCI Interrupt Generation
(Programmable)
Done
Chaining: Terminal
Count for Current
Descriptor
GNT# REQ# LHOLDA LHOLD
Releases control of the local bus whenever
the FIFO becomes empty, the local latency
timer expires, the BREQ input is asserted, or
a Direct PCI to Local Bus request is pending.
Rearbitrates for control of the local bus
when the preprogrammed number of
entries becomes available in the FIFO or
the PCI terminal count is reached. If the
latency timer has expired, waits until the
pause timer expires.
At the start of each block transfer, in
Chaining mode only, loads the DMA
Registers by reading four Lwords
from the address specified in the
Next Descriptor Pointer Register.
Chaining Mode Descriptors:
At the start of each block transfer, in
Chaining mode only, loads the DMA
Registers by reading four Lwords
from the address specified in the
Next Descriptor Pointer Register.
Chaining Mode Descriptors:
Figure 3-10. PCI to Local Bus DMA Data Transfer Operation
3.6.3.3 Unaligned Transfers
For unaligned local to PCI transfers, the PCI 9080 reads
a partial Lword from the local bus. It then continues to
read Lwords from the local bus. The Lwords are
assembled, aligned to the PCI bus address and loaded
into the FIFO.
For PCI to local transfers, Lwords are read from the PCI
bus and loaded into the FIFO. On the local side, the
Lwords are assembled from the FIFO, aligned to the
local bus address and written to the local bus. On both
the local and PCI buses, the byte enables for writes
determine LA0 and LA1 for the start of a transfer. For
the last transfer, the byte enables specify the bytes to be
written. All reads are Lwords.
3.6.4 Demand Mode DMA
A bit in the DMA Configuration Registers specifies that
the channel operates in Demand Mode. In Demand
Mode, the user sets up the configuration registers of the
DMA controller and initiates a transfer. The DMA
controller transfers data when it asserts the DREQ[1:0]#
input of the DMA channel. The DMA controller then
asserts DACK[1:0]# to indicate that the current local bus
transfer is in response to the DREQ[1:0]# input. The
DMA controller continues to transfer data until it reaches
the transfer count or until DREQ[1:0]# is de-asserted.
The minimum transfer size per DREQ[1:0]# input is one
Lword (32 bits). This may result in multiple transfers for
an 8- or 16-bit bus. Refer to the timing diagrams in
Section 8, “Timing Diagrams.”
3.6.5 DMA Priority
DMA Channel 0 priority, DMA Channel 1 priority, or
rotating priority can be specified in the DMA Arbitration
Register.
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