S2204
QUAD GIGABIT ETHERNET DEVICE
Table 8. Transmitter Output Signals
Pin Name
Level
I/O
Pin #
Description
TXAP
TXAN
Diff.
LVPECL
O
A17
B17
High speed serial outputs for Channel A.
TXBP
TXBN
Diff.
LVPECL
O
O
O
O
C17
D17
High speed serial outputs for Channel B.
High speed serial outputs for Channel C.
High speed serial outputs for Channel D.
TXCP
TXCN
Diff.
LVPECL
E17
F16
TXDP
TXDN
Diff.
LVPECL
F17
G17
TCLKO
TTL
J14
TTL Output Clock at the Parallel data rate. This clock is provided
for use by up-stream circuitry.
Table 9. Mode Control Signals
Pin Name
Level
I/O
Pin #
Description
TESTMODE
TTL
I
E4
Test Mode Control. Keep Low for normal operation.
TESTMODE1
TMODE
TTL
TTL
I
I
D4
Test Mode Control. Keep Low for normal operation.
B13
Transmit Mode Control. Controls the source of the clock used to
input and output data to and from the S2204. When TMODE is
Low, REFCLK is used to clock data on DINx[0:9] into the S2204.
TBCA is used to clock parallel data DOUTx[0:9] out of the device.
When TMODE is High, the TBCx inputs are used to clock data into
their respective channels. The output clocks are derived from the
receiver's CRUs.
CLKSEL
TTL
I
C12
REFCLK Select Input. This signal configures the PLL for the
appropriate REFCLK frequency. When CLKSEL = 0, the REFCLK
frequency equals the parallel word rate. When CLKSEL = 1, the
REFCLK frequency is 1/2 the parallel data rate.
REFCLK
RESET
RATE
TTL
TTL
TTL
I
I
I
H17
C15
D12
Reference Clock is used for the transmit VCO and frequency
check for the clock recovered from the receiver serial data. Also
used to clock parallel data into the device when in REFCLK mode.
When Low, the S2204 is held in reset. The receiver PLL is forced
to lock to the REFCLK. The FIFOs are initialized on the rising edge
of RESET. When High, the S2204 operates normally.
When Low, the S2204 operates with the serial output rate equal
to the VCO frequency. When High, the S2204 operates with the
VCO internally divided by 2 for all functions.
Note: All TTL inputs except REFCLK have internal pull-up networks.
16
October 9, 2000 / Revision E
AMCC [ APPLIED MICRO CIRCUITS CORPORATION ]
