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| 型号： | AN-136 |
| 厂商： | Integrated Device Technology, Inc. |
| 英文描述： | A NEW GENERATION OF TAG SRAMS?THE IDT71215 AND |
| 中文描述： | 作为TAG SRAM的呢？IDT71215和新一代 |
| 文件页数： | 5/12页 |
| 文件大小： | 103K |
| 代理商： | AN-136 |
5
A NEW GENERATION OF TAG SRAMS—THE IDT71215 AND IDT71216
APPLICATION NOTE AN-136
The 71215/16 is shown in more detail in Figure 4. The tag
memory is controlled by the Write Enable Tag (
WET
) and
Output Enable Tag (
OET
) pins. During writes,
WET
is synchro-
nous to CLK, as are the input data (TAG0 - TAG11) and
address (A0 - A13). Note that
WET
has no effect on the TAG
output buffers, so
OET
must be high to disable the outputs
during writes. Reads are performed by deasserting
WET
and
asynchronously asserting
OET
. For cache architectures in
which the tag is never read (e.g. write-through caches),
OET
may be tied to V
CC
. When both
WET
and
OET
are high, the
71215/16 is in the match mode, where the TAG0 - TAG11
inputs are compared with the stored data and are used to
generate the MATCH and
BRDY
/
TA
outputs. In both read and
match modes, the address path is flow-through for the fastest
possible response to a new address.
The three status bits of the 71215/16 are labeled VLD/S1,
DTY/S2, and WT/S3. The reason for the dual names is that
their functions vary, dependent on the state of the static Status
Function (SFUNC) input signal. When SFUNC is low, the
status bits are said to be in a “dedicated” mode and are
referred to as Valid, Dirty and Write-Through. See Figure 5.
When SFUNC is high, the status bits play no special role within
the 71215/16 and are simply referred to as Status 1, Status 2
and Status 3. See Figure 6. The functionality of VLD and WT
in the dedicated mode is described later. DTY/S2 does not
have any special functionality within the 71215/16.
Figure 5. Dedicated Mode Logic (71216 pin names are in parenthesis)
I/O
Address
V
D
WP
MATCH
W/
R
(TT1)
BRDYH (TAH)
BRDYOE
(
TAOE
)
COMPARE
MEMORY
WT
IN
/ S3
IN
DTY
IN
/ S2
IN
VLD
IN
/ S1
IN
WT
OUT
/ S3
OUT
DTY
OUT
/ S2
OUT
VLD
OUT
/ S1
OUT
BRDY
(
TA
)
BRDY
IN
(
TAIN
)
CLK
WES
WET
internal RESET
OE
71216 only
3176 drw 05
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