TLK6002 Datasheet, PDF (32/96 Pages) Texas Instruments – Dual Channel 0.47Gbps to 6.25Gbps Multi-Rate Transceiver

TLK6002
SLLSE34 – MAY 2010
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The locations where the comma transmission and reception are measured in TLK6002 are shown in
Figure 2-12.
TDA_[19:0]
TXCLK _A
Selected
Reference
Clock
RXCLK _A
20-bit
10-bit
10-bit
10-bit
Start
Counter
20-bit Latency
Counter
Stop
Counter
Pattern
Generator ¹⁰
10-bit
MUX
10-bit
2:1
MUX
10
Parallel to
Serial
¼, ½ &
Full rate
set
TCLK
Clock
Synthesizer
Pattern
Verifier
RDA_[19:0]
10-bit
COMMA
Detect& ^{10-bit Serial to}
8B/10B
Parallel
EQ
10-bit
10-bit
Decoding
TXAP
TXAN
RXAP
RXAN
Figure 2-12. Location of TX and RX Comma Character Detection (Only Channel A Shown)
2.20 CPRI/OBSAI Automatic Rate Sense (ARS) Function
An automatic rate sense (ARS) function is implemented in TLK6002 to facilitate determination of the
incoming CPRI/OBSAI serial link rate per channel.
When ARS is enabled, only three device input reference clock frequencies are supported: 122.88, 153.6,
and 307.2 MHz. ARS should not be enabled unless one of these three frequencies is available on either
REFCLK_0_P/N or REFCLK_1_P/N.
The ARS function per channel can operate off of either reference clock (REFCLK_0_P/N or
REFCLK_1_P/N), and is selected through device pins REFCLK_A_SEL for Channel A, and
REFCLK_B_SEL for Channel B (or alternatively mdio registers). The reference clock rate selection is
selected through channel A or B MDIO register bits (ARS_REF_FREQ[1:0], register bits 11.15:14), and
must be programmed for proper ARS operation (unless the default values matches the reference clock
input frequency).
32
Description
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