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參數(shù)資料
| 型號(hào)： | S2002 |
| 廠商： | Applied Micro Circuits Corp. |
| 英文描述： | Dual Serial Backplane Device(用于高速串行數(shù)據(jù)傳送的雙串行收發(fā)器) |
| 中文描述： | 雙串行背板設(shè)備（用于高速串行數(shù)據(jù)傳送的雙串行收發(fā)器） |
| 文件頁數(shù)： | 7/33頁 |
| 文件大?。?/td> | 311K |
| 代理商： | S2002 |
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7
S2002
DUAL SERIAL BACKPLANE DEVICE
October 9, 2000 / Revision B
Figure 6. DIN Data Clocking with TCLK
The S2002 also supports the traditional REFCLK
(TBC) clocking found in many Fibre Channel and
Gigabit Ethernet applications and is illustrated in Fig-
ure 7.
Half Rate Operation
The S2002 supports full and 1/2 rate operation for all
modes of operation. When RATE is LOW, the S2002
serial data rate equals the VCO frequency. When
RATE is HIGH, the VCO is divided by 2 before being
provided to the chip. Thus the S2002 can support
Fibre Channel and serial backplane functions at both
full and 1/2 the VCO rate. See Table 5.
8B/10B Coding
The S2002 provides 8B/10B line coding for each
channel. The 8B/10B transmission code includes se-
rial encoding and decoding rules, special characters,
and error control. Information is encoded, 8 bits at a
time, into a 10 bit transmission character. The char-
acters defined by this code ensure that enough tran-
sitions are present in the serial bit stream to make
clock recovery possible at the receiver. The encod-
ing also greatly increases the likelihood of detecting
any single or multiple errors that might occur during
the transmission and reception of data
1
.
The 8B/10B transmission code includes D-charac-
ters, used for data transmission, and K-characters,
used for control or protocol functions. Each D-char-
acter and K-character has a positive and a negative
parity version. The parity of each codeword is se-
lected by the encoder to control the running disparity
of the data stream. K-character generation is con-
trolled individually for each channel using the
KGENx input. When KGEN is asserted, the data on
the parallel input is mapped into the corresponding
control character. The parity of the K-character is
selected to minimize running disparity in the serial
data stream. Table 3 lists the K characters sup-
ported by the S2002 and identifies the mapping of
the DIN[7:0] bits to each character.
REFCLK
S2002
VCO/10 or VCO/20
TCLKx
DINx[0:7]
REF
OSCILLATOR
MAC
ASIC
TCLKO
PLL
1
1. A.X. Widner and P.A. Franaszek, "A Byte-Oriented DC Bal-
anced (0,4) 8B/10B Transmission Code," IBM Research Report
RC9391, May 1982.
Figure 7. DIN Clocking with REFCLK
REFCLK
S2002
TCLKx
DINx[0:7]
REF
OSCILLATOR
MAC
ASIC
TCLKO
PLL
VCO/10
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