33

COMMERCIALTEMPERATURERANGE

IDT723624/723634/723644 CMOS SyncBiFIFO™ WITH BUS-MATCHING

256 x 36 x 2, 512 x 36 x 2, 1,024 x 36 x 2

Figure 28. Timing for Mail2 Register and MBF2 Flag (IDT Standard and FWFT Modes)

NOTE:

1. If Port B is configured for word size, data can be written to the Mail2 Register using B0-B17 (B18-B35 are don’t care inputs). In this first case A0-A17 will have valid data

(A18-A35 will be indeterminate). If Port B is configured for byte size, data can be written to the Mail2 Register using B0-B8 (B9-B35 are don’t care inputs). In this second

case, A0-A8 will have valid data (A9-A35 will be indeterminate).

3270 drw30

CLKB

ENB

B0-B35

MBB

CSB

W/RB

CLKA

MBF2

CSA

MBA

ENA

A0-A35

W/

RA

W1

tENH

tDH

tPMF

tPMF

tENS2

tENH

tDIS

tEN

tMDV

tPMR

FIFO2 Output Register

W1 (Remains valid in Mail 2 Register after read)

tENH

tENH

tENH

tDS

tENS1

tENS1

tENS2

tENS2