31

COMMERCIALTEMPERATURERANGE

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

Figure 26. Timing for

Figure 27. Timing for Mail1 Register and

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:

AFB to transition HIGH in the next CLKB cycle. If the time between the rising CLKB edge and rising

AFB may transition HIGH one CLKB cycle later than shown.

2. FIFO2 write (

CSB = LOW, W/RB = LOW, MBB = LOW), FIFO2 read (CSA = LOW, W/RA = LOW, MBA = LOW). Data in the FIFO2 output register has been read from the FIFO.

3. D = Maximum FIFO Depth = 256 for the IDT72V3624, 512 for the IDT72V3634, 1,024 for the IDT72V3644.

4. If Port B size is word or byte,

AFB is set LOW by the last word or byte write of the long word, respectively.

AFB

CLKB

ENA

4664 drw28

ENB

CLKA

12

[D-(Y2+1)] Words in FIFO2

(D-Y2) Words in FIFO2

(1)

4664 drw29

CLKA

ENA

A0-A35

MBA

CSA

W/

RA

CLKB

MBF1

CSB

MBB

ENB

B0-B35

W/RB

W1

FIFO1 Output Register

W1 (Remains valid in Mail1 Register after read)