25

COMMERCIALTEMPERATURERANGE

BUS-MATCHING 2,048 x 36, 4,096 x 36, and 8,192 x 36

Figure 17. Timing for Mail1 Register and MBF1

MBF1

MBF1

MBF1

MBF1 Flag (IDT Standard and FWFT Modes)

NOTE:

1. If Port B is configured for word size, data can be written to the Mail1 Register using A0-A17 (A18-A35 are don't care inputs). In this first case B0-B17 will have valid data (B18-B35 will

be indeterminate). If Port B is configured for byte size, data can be written to the Mail1 Register using A0-A8

(A9-A35 are don't care inputs). In this second case, B0-B8 will have valid data (B9-B35 will be indeterminate).

NOTES:

2. FIFO Write (CSA = LOW, W/RA = HIGH, MBA = LOW), FIFO read (CSB = LOW, W/RB = HIGH, MBB = LOW). Data in the FIFO output register has been read from the FIFO.

3. D = Maximum FIFO Depth = 2,048 for the IDT72V3653, 4,096 for the IDT72V3663, 8,192 for the IDT72V3673.

Figure 16. Timing for AF

AF

AF

AF

AF when the FIFO is Almost-Full (IDT Standard and FWFT Modes).

AF

CLKA

ENB

4662 drw 18

ENA

CLKB

12

[D-(Y+1)] Words in FIFO

(D-Y) Words in FIFO

(1)

4662 drw19

CLKA

ENA

A0-A35

MBA

CSA

W/

RA

CLKB

MBF1

CSB

MBB

ENB

B0-B35

W/RB

FIFO Output Register

W1 (Remains valid in Mail1 Register after read)

W1