IDT7026L25J8(2015) データシートの表示（PDF） - Integrated Device Technology

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IDT7026L25J8
(Rev.:2015)

HIGH-SPEED 16K X 16 DUAL-PORT STATIC RAM

Integrated Device Technology 

IDT7026S/L

High-Speed 16K x 16 Dual-Port Static RAM

Military, Industrial and Commercial Temperature Ranges

Waveform of BUSY Arbitration Controlled by CE Timing (M/S = VIH)(1)

ADDR"A"

and "B"

ADDRESSES MATCH

CE"A"

CE"B"

BUSY"B"

tAPS (2)

tBAC

tBDC

2939 drw 14

Waveform of BUSY Arbitration Cycle Controlled by

Address Match Timing (M/S = VIH)(1)

ADDR"A"

ADDR"B"

BUSY"B"

tAPS (2)

ADDRESS "N"

MATCHING ADDRESS "N"

tBAA

tBDA

NOTES:

1. All timing is the same for left and right ports. Port “A” may be either the left or right port. Port “B” is the port opposite from “A”.

2. If tAPS is not satisfied, the BUSY signal will be asserted on one side or another but there is no guarantee on which side BUSY will be asserted.

2939 drw 15

Truth Table III — Example of Semaphore Procurement Sequence(1,2,3)

Functions

D0 - D15 Left

D0 - D15 Right

Status

No Action

1

1

Semaphore free

Left Port Writes "0" to Semaphore

0

1

Left port has semaphore token

Right Port Writes "0" to Semaphore

0

1

No change. Right side has no write access to semaphore

Left Port Writes "1" to Semaphore

1

0

Right port obtains semaphore token

Left Port Writes "0" to Semaphore

1

0

No change. Left port has no write access to semaphore

Right Port Writes "1" to Semaphore

0

1

Left port obtains semaphore token

Left Port Writes "1" to Semaphore

1

1

Semaphore free

Right Port Writes "0" to Semaphore

1

0

Right port has semaphore token

Right Port Writes "1" to Semaphore

1

1

Semaphore free

Left Port Writes "0" to Semaphore

0

1

Left port has semaphore token

Left Port Writes "1" to Semaphore

1

1

Semaphore free

NOTES:

1. This table denotes a sequence of events for only one of the eight semaphores on the IDT7026.

2. There are eight semaphore flags written to via I/O0 and read from all I/O's (I/O0-I/O15). These eight semaphores are addressed by A0 - A2.

3. CE = VIH, SEM = VIL to access the semaphores. Refer to the semaphore Read/Write Control Truth Table.

2939 tbl 15

61.442

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