Pin Functions; External Bus Slave Interface Pins; Sdram Bus Interface Pins - NEC V850E/MA1 Application Note

3.3 Pin Functions

The pin functions of each interface are described below.

3.3.1 External bus slave interface pins

Pin Name
I_SRST_B
I_CPU_CS0_B
I_CPU_CS1_B
I_CPU_CS2_B
I_CPU_ADR0 to I_CPU_ADR19
I_CPU_DATA0 to I_CPU_DATA31
O_CPU_DATA0 to O_CPU_DATA31
EN_CPU_DATA
I_CPU_BE_B0 to I_CPU_BE_B3
I_CPU_WE_B
I_CPU_OE_B
O_CPU_WAIT_B
O_PCIHOST_INT
I_MODE16

3.3.2 SDRAM bus interface pins

Pin Name
O_HOLDREQ_B
I_HOLDACK_B
I_SDCLK
O_SD_DATA0 to O_SD_DATA31
I_SD_DATA0 to I_SD_DATA31
EN_SD_DATA0, EN_SD_DATA1
O_SD_DQM_B0 to O_SD_DQM_B3
O_SD_ADR1 to O_SD_ADR25
O_SD_CKE
O_SD_CS_B
O_SD_RAS_B
O_SD_CAS_B
O_SD_WR_B
EN_SD_CTL
CHAPTER 3 SPECIFICATIONS OF PCI HOST BRIDGE MACRO
I/O
Input System reset input
Input PCI host bridge register chip select input
Input PCI I/O area chip select input
Input PCI memory area chip select input
Input CPU address input
Input CPU data input
Output CPU data output
Output CPU data output enable output
Input CPU data byte enable input
Input CPU write data enable input
Input CPU read data output enable input
Output CPU data wait output
Output PCI host bridge interrupt output
Input CPU data bus width select input
I/O
Output SDRAM bus hold request output
Input SDRAM bus hold acknowledge input
Input SDRAM clock input
Output SDRAM data output
Input SDRAM data input
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)
Output SDRAM data mask output
Output SDRAM address output
Output SDRAM clock enable output
Output SDRAM chip select output
Output SDRAM row address strobe output
Output SDRAM column address strobe output
Output SDRAM read/write output
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)
Application Note U17121EJ1V1AN
Function
Function
Active
Low
Low
Low
Low
−
−
−
High
−
Low
Low
Low
Low
Low: 32-bit width
High: 16-bit width
Active
Low
Low
−
−
−
←
Low
−
High
Low
Low
Low
Low
High
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