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IDT70V25L15PFG Datasheet(PDF) 6 Page - Integrated Device Technology |
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IDT70V25L15PFG Datasheet(HTML) 6 Page - Integrated Device Technology |
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6 / 25 page  6.42 IDT70V35/34S/L (IDT70V25/24S/L) High-Speed 3.3V 8/4K x 18 (8/4K x 16) Dual-Port Static RAM Industrial and Commercial Temperature Ranges 6 1. A12 is a NC for IDT70V34 and for IDT70V24. 2. I/O0x - I/O15x for IDT70V25/24. 3. Upper Byte Select controls pins 9-17 for IDT70V35/34 and controls pins 8-15 for IDT70V25/24. 4. Lower Byte Select controls pins 0-8 for IDT70V35/34 and controls pins 0-7 for IDT70V25/24. NOTES: Left Port Right Port Names CEL CER Chip Enable R/ WL R/ WR Read/Write Enable OEL OER Output Enable A0L - A12L(1) A0R - A12R(1) Address I/O0L - I/O17L(2) I/O0R - I/O17R(2) Data Input/Output SEML SEMR Semaphore Enable UBL UBR Upper Byte Select(3) LBL LBR Lower Byte Select (4) INTL INTR Interrupt Flag BUSYL BUSYR Busy Flag M/ S Master or Slave Select VDD Power (3.3V) VSS Ground (0V) 5624 tbl 01 Pin Names Truth Table II: Semaphore Read/Write Control(1) NOTE: 1. There are eight semaphore flags written to via I/O0 and read from all of the I/O's (I/O0-I/O17 for IDT70V35/34) and (I/O0-I/O15 for IDT70V25/24). These eight semaphores are addressed by A0-A2. Truth Table I: Non-Contention Read/Write Control NOTES: 1. A0L-A12L ≠ A0R-A12R for IDT70V35/34 and A0L-A11L ≠ A0R-A11R for IDT70V25/24. 2. Outputs for IDT70V25/24 are I/O0x-I/O7x. 3. Outputs for IDT70V25/24 are I/O8x-I/O15x. Inputs (1) Outputs Mode CE R/ W OE UB LB SEM I/O9-17 (3) I/O0-8 (2) H X X X X H High-Z High-Z Deselected: Power Down X X X H H H 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 LLH H DATAOUT High-Z Read Upper Byte Only L H LH LH High-Z DATAOUT Read Lower Byte Only LH LL L H DATAOUT DATAOUT Read Both Bytes XXH XX X High-Z High-Z Outputs Disabled 5624 tbl 02 Inputs Outputs Mode CE R/ W OE UB LB SEM I/O9-17 (1) I/O0-8 (1) HH L X X L DATAOUT DATAOUT Read Data in Semaphore Flag X H L HHL DATAOUT DATAOUT Read Data in Semaphore Flag H ↑ XXX L DATAIN DATAIN Write I/O0 into Semaphore Flag X ↑ X HHL DATAIN DATAIN Write I/O0 into Semaphore Flag LX X L XL ____ ____ Not Allowed LX X X L L ____ ____ Not Allowed 5624 tbl 03 |
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