CYDC256B16, CYDC128B16,
CYDC064B16, CYDC128B08,
CYDC064B08
Table 3. Input Read Register Operation[16, 19]
| SFEN |
|
| CE |
| R/W |
| OE |
| UB |
| LB | ADDR |
|
| Mode | |||||||
| H |
|
| L |
| H |
| L |
| L |
| L | VALID[17] | VALID[17] | Standard Memory Access | ||||||||
| L |
|
| L |
| H |
| L |
| X |
| L | x0000 | VALID[18] | X | IRR Read | |||||||
Table 4. Output Drive Register [20] |
|
|
|
|
|
|
|
|
|
|
|
| |||||||||||
| SFEN |
|
| CE |
| R/W |
|
| OE |
|
| UB |
|
| LB |
|
| ADDR |
|
| Mode | ||
| H |
|
| L |
| H | X[21] | L[17] | L[17] |
| VALID[17] | VALID[17] | Standard Memory Access | ||||||||||
| L |
|
| L |
| L |
| X |
| X |
| L |
| x0001 |
| VALID[18] | X | ODR Write[20, 22] | |||||
| L |
|
| L |
| H |
| L |
| X |
| L |
| x0001 |
| VALID[18] | X | ODR Read[20] | |||||
Table 5. Semaphore Operation Example
Function |
| Status | |
No action | 1 | 1 | |
|
|
|
|
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 | |
|
|
|
|
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 | |
|
|
|
|
Notes: |
|
|
|
16.SFEN = VIL for IRR reads.
17.UB or LB = VIL. If LB = VIL, then DQ<7:0> are valid. If UB = VIL then DQ<15:8> are valid.
18.LB must be active (LB = VIL) for these bits to be valid.
19.SFEN active when either CEL = VIL or CER = VIL. It is inactive when CEL = CER = VIH.
20.SFEN = VIL for ODR reads and writes.
21.Output enable must be low (OE = VIL) during reads for valid data to be output.
22.During ODR writes data will also be written to the memory.
Document #: | Page 8 of 26 |
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