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IDT707278L20PFI Datasheet(PDF) 4 Page - Integrated Device Technology |
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IDT707278L20PFI Datasheet(HTML) 4 Page - Integrated Device Technology |
4 / 16 page 6.42 IDT707278S/L 32K x 16 Bank-Switchable Dual-Ported SRAM with External Bank Selects Industrial and Commercial Temperature Ranges 4 Truth Table III Mailbox Read/Write Control(1) NOTES: 1. Chip Enable references are shown above with the actual CE0 and CE1 levels, CE is a reference only. 2. Port "A" and "B" references are located where CE is used. 3. "H" = VIH and "L" = VIL. 4. CE and MBSEL cannot be active at the same time. Truth Table I Chip Enable(1,2,3,4) Truth Table II Non-Contention Read/Write Control NOTES: 1. BA0L - BA1L ¹ BA0R - BA1R: cannot access same bank simultaneously from both ports. 2. Refer to Truth Table I. 3. CE and MBSEL cannot both be active at the same time. NOTES: 1. There are four mailbox locations per port written to and read from all the I/O's (I/O0-I/O15). These four mailboxes are addressed by A0-A5. Refer to Truth Table V. 2. Refer to Truth Table I. 3. Each mailbox location contains a 16-bit word, controllable in bytes by setting input levels to UB and LB appropriately. CE CE0 CE1 Mode L VIL VIH Port Selected (TTL Active) < 0.2V >VCC -0.2V Port Selected (CMOS Active) H VIH X Port Deselected (TTL Inactive) XVIL Port Deselected (TTL Inactive) >VCC -0.2V X Port Deselected (CMOS Inactive) X<0.2V Port Deselected (CMOS Inactive) 3739 tbl 02 Inputs (1) Outputs Mode CE(2) R/ W OE UB LB MBSEL I/O8-15 I/O0-7 H X X X X H High-Z High-Z Deselcted: Power-Down X (3) XX H H X (3) High-Z High-Z Both Bytes Deselected LL X L H H DATAIN High-Z Write to Upper Byte Only L L X H L H High-Z DATAIN Write to Lower Byte Only LL X L L H DATAIN DATAIN Write to Both Bytes LH L L H H DATAOUT High-Z Read Upper Byte Only LH LH LH High-Z DATAOUT Read Lower Byte Only LH L L LH DATAOUT DATAOUT Read Both Bytes X (3) XH X X X (3) High-Z High-Z Outputs Disabled 3739 tbl 03 Inputs Outputs Mode CE(2) R/ W OE UB LB MBSEL I/O8-15 I/O0-7 HH L X(3) X(3) LDATAOUT DATAOUT Read Data from Mailbox, ↓ clears interrupt H H LLL L DATAOUT DATAOUT Read Data from Mailbox, ↓ clears interrupt HL X L(3) L(3) LDATAIN DATAIN Write Data into Mailbox L XXXX L ____ ____ Not Allowed 3739 tbl 04 |
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