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參數(shù)資料
| 型號(hào)： | S2018 |
| 廠商： | Applied Micro Circuits Corp. |
| 英文描述： | 17 × 17 3.2 Gbps Differential Crosspoint Switch(17 × 17 3.2 Gbps高速差分正交開關(guān)) |
| 中文描述： | 17 × 17 3.2 Gbps差分交叉點(diǎn)開關(guān)（17 × 17 3.2 Gbps的高速差分正交開關(guān)） |
| 文件頁數(shù)： | 3/21頁 |
| 文件大?。?/td> | 186K |
| 代理商： | S2018 |
3
S2018
17 X 17 3.2 GBIT/S DIFFERENTIAL CROSSPOINT SWITCH
July 25, 2000 / Revision D
DATA TRANSFER
For each configured connection between a differen-
tial input pair and an enabled output pair, any data
appearing at the input pair will be passed immedi-
ately through to the output pair.
CONFIGURATION
The S2018 can be selectively configured one output
pair at a time, or any number of output pairs simulta-
neously. Configuration data is stored in 17 registers,
one register for each output pair. The data in these
17 configurations register makes up the configura-
tion register file. As shown in Figure 2, the configura-
tion data is passed in parallel from all 17 registers to
a latch, which holds the active switch configuration.
This two-stage arrangement allows one or more out-
put pairs to be configured simultaneously. A Chip
Select pin (CSN) is provided to simplify interfacing
this switch to the system microprocessor.
The S2018 minimizes the configuration time through
the use of the active configuration latch. While the
switch is operational, and prior to the time at which it
must be reconfigured, a new configuration is loaded
into the configuration register file. Once the configu-
ration register file contains the desired connection
information, the contents of the registers are trans-
ferred in parallel to the active configuration latch by
the CONFIGN strobe.
To connect an output to a given input, the output to
be configured is selected using the OADDR[4:0]
(OADDR4=MSB) inputs. See Table 1. With the out-
put configuration register selected, the desired input
selection must be provided in the IADDR[4:0]
(IADDR4=MSB) inputs. The IADDR[4:0] information
is stored into the selected output configuration regis-
ter by the LOADN strobe. The configuration process
is described by the flow chart in Figure 5.
The active configuration latch can be made transpar-
ent by activating the CONFIGN input. When this is
done, changes strobed into the output pair configu-
ration registers by the LOADN input pair will be
passed immediately to the switch.
The S2018 supports both broadcast and multicast
operation: any of the 17 differential input pairs can
be connected to any or all of the 17 differential out-
put pairs.
OUTPUT SWING ADJUST
The S2018 output swing can be adjusted by con-
necting one or more of the VADJUSTx pins to the
VCSHIGH pin according to Table 2. Note that as the
output swing is increased, the power dissipated by
the part is proportionally increased (See Table 10).
Figure 3. Data Transfer Waveforms
Figure 4. Reconfiguration Waveforms
1
u
a
V
2
u
a
V
3
u
a
V
)
D
p
p
V
m
(
x
x
T
U
O
D
T
O
T
O
T
O
T
O
T
T
O
O
T
T
O
O
O
T
T
T
T
0
0
0
0
0
4
4
0
8
4
2
4
6
7
9
0
0
0
6
1
2
1
1
Table 2. Output Swing Adjust Pin Settings
Note: T = Ties pin(s) VADJUSTx to pin VCSHIGH
O = Open
tCFDO
tLDDO
tDIDO
DIMPW
DIN[16:0]P/N
DOUT[16:0]P/N
CONFIGN
CSN
LOADN
A
A
B
C
D
E
B
C
D
E
tCSDO
tSUIA
LDMPW
tHIA
tSULC
CFMPW
tSUOA
tHOA
OADDR[4:0]
IADDR[4:0]
CSN
LOADN
VALID
VALID
CONFIGN
tSUCS
tHCS
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