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 = V IH ) (1)
ADDR "A"
and "B"
CE "A"
CE "B"
t APS (2)
t BAC
ADDRESSES MATCH
t BDC
BUSY "B"
2939 drw 14
Waveform of BUSY Arbitration Cycle Controlled by
Address Match Timing (M/ S = V IH ) (1)
ADDR "A"
ADDR "B"
t APS
(2)
ADDRESS "N"
MATCHING ADDRESS "N"
t BAA
t BDA
BUSY "B"
2939 drw 15
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 t APS 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.
Truth Table III — Example of Semaphore Procurement Sequence (1,2,3)
Functions
No Action
Left Port Writes "0" to Semaphore
Right Port Writes "0" to Semaphore
Left Port Writes "1" to Semaphore
Left Port Writes "0" to Semaphore
Right Port Writes "1" to Semaphore
Left Port Writes "1" to Semaphore
Right Port Writes "0" to Semaphore
Right Port Writes "1" to Semaphore
Left Port Writes "0" to Semaphore
Left Port Writes "1" to Semaphore
D 0 - D 15 Left
1
0
0
1
1
0
1
1
1
0
1
D 0 - D 15 Right
1
1
1
0
0
1
1
0
1
1
1
Status
Semaphore free
Left port has semaphore token
No change. Right side has no write access to semaphore
Right port obtains semaphore token
No change. Left port has no write access to semaphore
Left port obtains semaphore token
Semaphore free
Right port has semaphore token
Semaphore free
Left port has semaphore token
Semaphore free
2939 tbl 15
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/O 0 and read from all I/O's (I/O 0 -I/O 15 ). These eight semaphores are addressed by A 0 - A 2 .
3. CE = VIH, SEM = VIL to access the semaphores. Refer to the semaphore Read/Write Control Truth Table.
14
6.42
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