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| 型号： | OR3T306S240I-DB |
| 厂商： | LATTICE SEMICONDUCTOR CORP |
| 元件分类： | FPGA |
| 英文描述： | FPGA, 196 CLBS, 48000 GATES, PQFP240 |
| 封装： | PLASTIC, SQFP-240 |
| 文件页数： | 164/203页 |
| 文件大小： | 1368K |
| 代理商： | OR3T306S240I-DB |
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Lattice Semiconductor
63
Data Sheet
November 2006
ORCA Series 3C and 3T FPGAs
Microprocessor Interface (MPI) (continued)
PowerPC System
In Figure 43, the
ORCA FPGA is a memory-mapped
peripheral to the
PowerPC processor. The PowerPC
interface uses separate address and data buses and
has several control lines. The
ORCA chip select lines,
CS0
and CS1, are each connected to an address line
coming from the
PowerPC. In this manner, the FPGA is
capable of a transaction with the
PowerPC whenever
the address line connected to CS0 is low, the address
line for CS1 is high, and there is a valid address on
PowerPC address lines A[27:31]. Other forms of selec-
tion are possible by using the FPGA chip selects in a
different way. For example,
PowerPC address bits
A[0:26] could be decoded to select CS0 and CS1, or if
the FPGA is the only peripheral to the
PowerPC, CS0
and CS1 could be tied low and high, respectively, to
cause them to always be selected. If the MPI is not
used for FPGA conguration, decoding logic can be
implemented internal or external to the FPGA. If logic
internal to the FPGA is used, the chip selects must be
routed out on an output pin and then connected exter-
nally to CS0 and/or CS1. If the MPI is to be used for
conguration, any decode logic used must be imple-
mented external to the FPGA since the FPGA logic has
not been congured yet.
5-5761(F)
Note: FPGA shown as a memory-mapped peripheral using CS0 and
CS1. Other decoding schemes are possible using CS0 and/or
CS1.
Figure 43.
PowerPC/MPI
The basic ow of a transaction on the
PowerPC/MPI
interface is given below. Pin descriptions are shown in
Table 16 and timing is shown in the Timing Characteris-
tics section of this data sheet. For both read and write
transactions, the address, chip select, and read/write
(read high, write low) signals are set up at the FPGA
pins by the
PowerPC. The PowerPC then asserts its
transfer start signal (TS) low. Data is available to the
MPI
during a write at the rising clock edge after the
clock cycle during which TS is low. The transfer is
acknowledged to the
PowerPC by the low asser tion of
the TA signal. The MPI
PowerPC interface does not
support burst transfers, so the burst inhibit signal, BI, is
also asserted low during the transfer acknowledge . The
same process applies to a read from the MPI except
that the read data is expected at the FPGA data pins by
the
PowerPC at the rising edge of the clock when TA is
low. The MPI only drives TA low for one clock cycle.
Interrupt requests can be sent to the
PowerPC asyn-
chronously to the read/write process. Interrupt requests
are sourced by the user-logic in the FPGA. The MPI will
assert the request to the
PowerPC as a direct interrupt
signal and/or a pollable bit in the MPI status register
(discussed in the MPI Setup and Control section). The
MPI
will continue to assert the interrupt request until
the user-logic deasserts its interrupt request signal.
Table 16.
PowerPC/MPI Conguration
DOUT
CCLK
D[7:0]
A[4:0]
MPI_CLK
MPI_RW
MPI_ACK
MPI_BI
MPI_IRQ
MPI_STRB
CS0
CS1
HDC
LDC
D[7:0]
A[27:31]
CLKOUT
RD/WR
TA
BI
IRQx
TS
A26
A25
TO DAISY-
CHAINED
DEVICES
POWERPC
ORCA
8
FPGA
SERIES 3
DONE
INIT
PowerPC
Signal
ORCA Pin
Name
MPI
I/O
Function
D[0:7]
D[7:0]
I/O
8-bit data bus
A[27:31]
A[4:0]
I
5-bit
MPI address
bus
TS
RD/MPI_STRB
I
Transfer start signal
—
CS0
I
Active-low
MPI
select
—
CS1
I
Active-high
MPI
select
CLKOUT
A7/MPI_CLK
I
PowerPC interface
clock
RD/WR
A8/MPI_RW
I
Read (high)/write
(low) signal
TA
A9/MPI_ACK
O
Active-low transfer
acknowledge signal
BI
A10/MPI_BI
O
Active-low burst
transfer inhibit
signal
Any of
IRQ
[7:0]
A11/MPI_IRQ
O
Active-low interrupt
request signal
Select
devices
have
been
discontinued.
See
Ordering
Information
section
for
product
status.
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