Revision 1.26 – October 15, 2007
440EPx – PPC440EPx Embedded Processor
Preliminary Data Sheet
Table 8. Signal Functional Description (Sheet 4 of 9)
Notes:
1. Receiver input has hysteresis
2. Must pull up (recommended value is 3kΩ to OV
(EOV
for Ethernet)
DD
DD
3. Must pull down (recommended value is 1kΩ)
4. If not used, must pull up (recommended value is 3kΩ to OV
(EOV
for Ethernet)
DD
DD
5. If not used, must pull down (recommended value is 1kΩ)
6. Strapping input during reset; pull-up or pull-down required
Signal Name
Description
I/O
Type
Notes
External Slave Peripheral Interface
Used by the PPC440EPx to indicate that data transfers have
occurred.
DMAAck0:3
DMAReq0
DMAReq1
O
I
3.3V LVTTL
3.3V LVTTL
3.3V LVTTL
1
1
Used by slave peripherals to indicate they are prepared to
transfer data.
Used by slave peripherals to indicate they are prepared to
transfer data.
I
1, 5
Used by slave peripherals to indicate they are prepared to
transfer data.
DMAReq2:3
I
3.3V LVTTL
3.3V LVTTL
3.3V LVTTL
1
1
EOT0:3/TC0:3
PerAddr02:07
End Of Transfer/Terminal Count.
I/O
I/O
Peripheral address bus used by the PPC440EPx when not in
external master mode; otherwise, used by external master.
1, 2
Peripheral address bus used by the PPC440EPx when not in
external master mode; otherwise, used by external master.
PerAddr08:31
PerData00:31
I/O
I/O
3.3V LVTTL
3.3V LVTTL
Peripheral data bus used by the PPC440EPx when not in
external master mode; otherwise, used by external master.
Note: PerData00 is the most significant bit (msb) on this bus.
Peripheral data bus parity used by the PPC440EPx when not in
external master mode; otherwise, used by external master.
PerDataPar0:3
PerBLast
I/O
I/O
3.3V LVTTL
3.3V LVTTL
Used by either the peripheral controller, DMA controller, or
external master to indicates the last transfer of a memory access.
1, 4
PerCS0
External peripheral device select.
External peripheral device select.
O
3.3V LVTTL
3.3V LVTTL
2
PerCS1:5
I/O
1, 2
Used by either peripheral controller or DMA controller depending
upon the type of transfer involved. When the PPC440EPx is the
bus master, it enables the selected device to drive the bus.
PerOE
O
I
3.3V LVTTL
3.3V LVTTL
1, 2
1
PerReady
Used by a peripheral slave to indicate it is ready to transfer data.
Used by the PPC440EPx when not in external master mode, as
output by either the peripheral controller or DMA controller
depending upon the type of transfer involved. High indicates a
read from memory, low indicates a write to memory.
PerR/W
I/O
3.3V LVTTL
1, 2
Otherwise, it is used by the external master as an input to
indicate the direction of transfer.
PerWBE0:3
PerErr
External peripheral data bus byte enables.
I/O
I
3.3V LVTTL
3.3V LVTTL
1, 2
1
External Error. Used as an input to record external slave
peripheral errors.
60
AMCC Proprietary
AMCC [ APPLIED MICRO CIRCUITS CORPORATION ]
