Rainbow Electronics AT75C220 - Manual (Page 3)

AT75C220
3
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