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UPD703103A Datasheet(PDF) 33 Page - NEC

No. de Pieza. UPD703103A
Descripción  32-Bit Single-Chip Microcontrollers
Descarga  99 Pages
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Fabricante  NEC [NEC]
Página de inicio  http://www.nec.com/
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UPD703103A Datasheet(HTML) 33 Page - NEC

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CHAPTER 3 SPECIFICATIONS OF PCI HOST BRIDGE MACRO
Application Note U17121EJ1V1AN
33
3.3 Pin Functions
The pin functions of each interface are described below.
3.3.1 External bus slave interface pins
Pin Name
I/O
Function
Active
I_SRST_B
Input
System reset input
Low
I_CPU_CS0_B
Input
PCI host bridge register chip select input
Low
I_CPU_CS1_B
Input
PCI I/O area chip select input
Low
I_CPU_CS2_B
Input
PCI memory area chip select input
Low
I_CPU_ADR0 to I_CPU_ADR19
Input
CPU address input
I_CPU_DATA0 to I_CPU_DATA31
Input
CPU data input
O_CPU_DATA0 to O_CPU_DATA31
Output
CPU data output
EN_CPU_DATA
Output
CPU data output enable output
High
I_CPU_BE_B0 to I_CPU_BE_B3
Input
CPU data byte enable input
I_CPU_WE_B
Input
CPU write data enable input
Low
I_CPU_OE_B
Input
CPU read data output enable input
Low
O_CPU_WAIT_B
Output
CPU data wait output
Low
O_PCIHOST_INT
Output
PCI host bridge interrupt output
Low
I_MODE16
Input
CPU data bus width select input
Low: 32-bit width
High: 16-bit width
3.3.2 SDRAM bus interface pins
Pin Name
I/O
Function
Active
O_HOLDREQ_B
Output
SDRAM bus hold request output
Low
I_HOLDACK_B
Input
SDRAM bus hold acknowledge input
Low
I_SDCLK
Input
SDRAM clock input
O_SD_DATA0 to O_SD_DATA31
Output
SDRAM data output
I_SD_DATA0 to I_SD_DATA31
Input
SDRAM data input
EN_SD_DATA0, EN_SD_DATA1
Output
SDRAM data enable output
Low: Lower 16 bits (O_SD_DATA0 to O_SD_DATA15)
High: Higher 16 bits (O_SD_DATA16 to O_SD_DATA31)
O_SD_DQM_B0 to O_SD_DQM_B3
Output
SDRAM data mask output
Low
O_SD_ADR1 to O_SD_ADR25
Output
SDRAM address output
O_SD_CKE
Output
SDRAM clock enable output
High
O_SD_CS_B
Output
SDRAM chip select output
Low
O_SD_RAS_B
Output
SDRAM row address strobe output
Low
O_SD_CAS_B
Output
SDRAM column address strobe output
Low
O_SD_WR_B
Output
SDRAM read/write output
Low
EN_SD_CTL
Output
SDRAM control signal output enable output
(Output buffer enable of O_SD_ADR1 to O_SD_ADR25,
O_SD_CKE, O_SD_CS_B, O_SD_RAS_B,
O_SD_CAS_B, and O_SD_WR_B pins)
High


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