參數(shù)資料
型號(hào)： UPD30181AYF1-131-GA3-A
廠商： NEC Corp.
英文描述： 64-/32-BIT MICROPROCESSOR
中文描述： 64-/32-BIT微處理器
文件頁(yè)數(shù)： 10/72頁(yè)
文件大?。?/td> 447K
代理商： UPD30181AYF1-131-GA3-A
Data Sheet U16277EJ1V0DS
10
μ
PD30181A, 30181AY
1. PIN FUNCTIONS
Remark
# indicates active low.
1.1 Pin Functions
(1) System bus interface signals
(1/3)
Signal Name
I/O
Function
Alternate Function
A24
O
CKE1
A23
O
RP#
A(22:15)
O
Address bus
These pins are used to specify system bus addresses.
They are used to access ROM, flash memory, SRAM, ISA devices, PC
Cards, IDE (ATA) devices, and general-purpose devices.
GPIO(61:54)
SA10
O
Address bit 10 for SDRAM or SyncFlash memory
Instead of connecting to A10, connect this pin (SA10) to address bit 10 in
SDRAM or SyncFlash memory.
–
A(14:0)
O
Address bus
These pins are used to specify system bus addresses.
They are used to access SDRAM, SyncFlash memory, ROM, flash
memory, SRAM, ISA devices, CompactFlash/PC Cards, IDE (ATA)
devices, and general-purpose devices.
–
D(31:0)
I/O
Data bus
These pins are used to transfer data to the V
R
4181A and SDRAM,
SyncFlash memory, ROM, flash memory, SRAM, ISA devices,
CompactFlash/PC Cards, IDE (ATA) devices, and general-purpose
devices.
–
PCS(4:0)#
O
Programmable chip select
These pins can be set as active when the V
R
4181A accesses ROM, flash
memory, SRAM, and general-purpose devices. They can be connected
only to devices that are not subject to bus sizing via the IOCS16# pin.
–
ROMCS#
O
Boot ROM chip select
This pin can be set as active when the V
R
4181A accesses boot ROM or
flash memory. When the BMODE(1:0) pin status is 01 and the RTCRST#
signal has been cleared, the V
R
4181A fetches the boot code from a
device connected to the ROMCS# pin to activate this pin.
–
MEMRD#
O
System bus memory read
This pin becomes active when the V
R
4181A reads data from any of the
following devices.
ROM, flash memory, SRAM, or general-purpose devices controlled by
the ROMCS# pin or PCS# pin
External ISA bus memory space devices and CompactFlash/PC Card
memory space devices
–
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