S2004TB Applied Micro Circuits Corporation, S2004TB Datasheet - Page 7

• Manufacturer Part Number: S2004TB
• Manufacturer: Applied Micro Circuits Corporation

Specifications of S2004TB

• Operating Supply Voltage (typ): 3.3V
• Operating Supply Voltage (min): 3.13V
• Operating Supply Voltage (max): 3.47V
• Operating Temp Range: 0C to 70C
• Operating Temperature Classification: Commercial
• Mounting: Surface Mount
• Pin Count: 208
• Lead Free Status / RoHS Status: Not Compliant

Figure 6. DINx Data Clocking with TCLK
The S2004 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 S2004 supports full and 1/2 rate operation for all
modes of operation. When RATE is LOW, the S2004
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 S2004 can support
Fibre Channel and serial backplane functions at both
full and 1/2 the VCO rate. (See Table 5.)
8B/10B Coding
The S2004 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-
1
anced (0,4) 8B/10B Transmission Code," IBM Research Report
RC9391, May 1982.
October 10, 2000 / Revision D
QUAD SERIAL BACKPLANE DEVICE
1. A.X. Widner and P.A. Franaszek, "A Byte-Oriented DC Bal-
ASIC
MAC
TCLKO
DINx[0:7]
TCLKx
VCO/10 or VCO/20
OSCILLATOR
S2004
REFCLK
PLL
REF
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
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 S2004 and identifies the mapping of
the DIN[7:0] bits to each character.
Figure 7. DIN Clocking with REFCLK
OSCILLATOR
ASIC
MAC
VCO/10
REF
TCLKO
DINx[0:7]
TCLKx
REFCLK
S2004
1
PLL
.
S2004
7