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Document #: 001-01638 Rev. *E Page 8 of 26
Table 3. Input Read Register Operation
[16, 19]
SFEN CE R/W OE UB LB ADDR I/O
0
–I/O
1
I/O
2
–I/O
15
Mode
HLHLLLx0000-MaxVALID
[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 I/O
0
–I/O
4
I/O
5
–I/O
15
Mode
HLHX
[21]
L
[17]
L
[17]
x0000-Max VALID
[17]
VALID
[17]
Standard Memory Access
LLLXXLx0001VALID
[18]
X ODR Write
[20, 22]
LLHLXLx0001VALID
[18]
X ODR Read
[20]
Table 5. Semaphore Operation Example
Function I/O
0
–I/O
15
Left I/O
0
–I/O
15
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:
16.SFEN
= V
IL
for IRR reads.
17.UB
or LB = V
IL
. If LB = V
IL
, then DQ<7:0> are valid. If UB = V
IL
then DQ<15:8> are valid.
18.LB
must be active (LB = V
IL
) for these bits to be valid.
19.SFEN
active when either CE
L
= V
IL
or CE
R
= V
IL
. It is inactive when CE
L
= CE
R
= V
IH
.
20.SFEN
= V
IL
for ODR reads and writes.
21.Output enable must be low (OE
= V
IL
) during reads for valid data to be output.
22.During ODR writes data will also be written to the memory.
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