npe405h Applied Micro Circuits Corporation (AMCC), npe405h Datasheet - Page 47

• Manufacturer Part Number: npe405h
• Description: Powernp Npe405h Embedded Processor
• Manufacturer: Applied Micro Circuits Corporation (AMCC)

NPe405H – PowerNP NPe405H Embedded Processor
Table 6. Signal Functional Description (Sheet 5 of 9)
Notes:
1. Receiver input has hysteresis.
2. Must pull up. See “Pull-up and Pull-down Resistors” on page 42 for recommended termination values.
3. Must pull down. See “Pull-up and Pull-down Resistors” on page 42 for recommended termination values.
4. If not used, must pull up.
5. If not used, must pull down.
6. Strapping input during reset; pull up or pull down as required.
7. Pull-up may be required. See “External Peripheral Bus Control Signals” on page 42.
AMCC Proprietary
External Slave Peripheral Bus Interface
MemClkOut0:1
PerData00:31
PerAddr00:31
Signal Name
PerWBE0:3
BankSel0:3
[PerCS1:7]
PerPar0:3
PerReady
PerBLast
ClkEn0:1
DQMCB
[PerWE]
ECC0:7
PerCS0
PerR/W
PerOE
PerClk
PerErr
WE
DQM for ECC check bits.
ECC check bits 0:7.
Select up to four external SDRAM banks.
Write Enable.
SDRAM Clock Enable.
Two copies of an SDRAM clock allows, in some cases,
glueless SDRAM attachment without requiring this signal to
be repowered by a PLL or zero-delay buffer.
External peripheral data bus when not in external master
mode, otherwise used by external master.
Note: PerData00 is the most significant bit (msb) on this bus.
External peripheral address bus when not in external master
mode, otherwise used by external master.
External peripheral byte parity signals.
Peripheral write-byte enable. Byte-enables which are valid for
an entire cycle or write-byte-enables which are valid for each
byte on each data transfer, allowing partial word transactions.
Used by either external bus controller or DMA controller
depending upon the type of transfer involved. Used as inputs
when external bus master owns the external interface.
Peripheral write enable. Low when any of the four PerWBE
signals are low.
Peripheral Chip Selects
Peripheral output enable. Used by either the external bus
controller or the DMA controller depending upon the type of
transfer involved. When the NPe405H is the bus master, it
enables the peripherals to drive the bus.
Peripheral read/write. Used when not in external master mode
by either the external bus controller or DMA controller
depending upon the type of transfer involved. High indicates a
read from memory, low indicates a write to memory.
Otherwise it used by the external master as an input to
indicate the direction of transfer.
Indicates peripheral is ready to transfer data.
Peripheral burst last. Used to indicate the last transfer of a
memory access.
Peripheral Clock. Used by an external master and by
synchronous peripheral slaves.
Used to indicate errors from peripherals.
Description
Revision 1.02 – November 16, 2007
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
O
O
O
O
O
O
O
O
I
I
3.3V LVTTL
3.3V LVTTL
3.3V LVTTL
3.3V LVTTL
3.3V LVTTL
3.3V LVTTL
3.3V LVTTL
3.3V LVTTL
3.3V LVTTL
3.3V LVTTL
3.3V LVTTL
3.3V LVTTL
3.3V LVTTL
3.3V LVTTL
3.3V LVTTL
3.3V LVTTL
3.3V LVTTL
3.3V LVTTL
5V tolerant
5V tolerant
5V tolerant
5V tolerant
5V tolerant
5V tolerant
5V tolerant
5V tolerant
5V tolerant
5V tolerant
5V tolerant
5V tolerant
Type
Data Sheet
DS2011
Notes
1, 2, 7
1, 7
1, 5
1
1
1
7
7
1
1
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