User Manual

AT75C220

Pin Description

Table 1. AT75C220 Pin Description List

Block Pin Name Function Type

Common Bus A[21:0] Address Bus Output

D[15:0] Data Bus Input/Output

NREQ Bus Request Input

NGNT Bus Grant Output

Synchronous Dynamic

Memory Controller

DCLK SDRAM Clock Output

DQM[1:0] SDRAM Byte Masks Output

CS0 SDRAM Chip Select 0 Output

CS1 SDRAM Chip Select 1 Output

RAS Row Address Strobes Output

CAS Column Address Strobes Output

WE SDRAM Write Enable Output

Static Memory Controller NCE0, NCE3 Chip Selects Output

NWE[1:0] Byte Select/Write Enable Output

NSOE Output Enable Output

NWR Memory Block Write Enable Output

NWAIT Enable Wait States Input

I/O Port A PA[12:0] General-purpose I/O lines. Multiplexed with

peripheral I/Os.

Input/Output

PA[19] General-purpose I/O line. Multiplexed with

peripheral I/Os.

Input/Output

I/O Port B PB[9:0] General-purpose I/O lines. Multiplexed with

peripheral I/Os.

Input/Output

DSP Subsystem OAKAIN[1:0] OakDSPCore User Input Input

OAKAOUT[1:0] OakDSPCore User Output Output

Timer/Counter 0 TCLK0 Timer 0 External Clock Input

TIOA0 Timer 0 Signal A Input/Output

TIOB0 Timer 0 Signal B Input/Output

Timer/Counter 1 TCLK1 Timer 1 External Clock Input

TIOA1 Timer 1 Signal A Input/Output

TIOB1 Timer 1 Signal B Input/Output

Watchdog NWDOVF Watchdog Overflow Output