S2046/S2047
GIGABIT ETHERNET CHIPSET
Timing
When a 62.5 MHz module is in frequency lock (either
with REFCLK or a serial data stream) RCLKN shall
never have a high level duration (>2.0 v) which is
less than 6.0 ns, nor a low level duration (<0.8 v)
which is less than 5.5 ns (no clock shivering shall
occur). At byte realignment, RCLKN clock states are
to be extended rather than truncated). When the
S2047 is in frequency lock (either with REFCLK or a
serial data stream) and LOCK_REF has been inac-
tive for at least 2500 baud times the minimum
instantaneous period shall always be greater that 16.0
ns. When the PLL is adjusting to a new phase or a
new frequency, where both the old and new frequen-
cies are valid Gigabit Ethernet frequencies, RCLKN
shall never have a period less than 16.0 ns.
This section will detail the timing requirements of all
of the signals on the interface. All timing is measured
into a lumped 35 pf capacitive load.
RBC[N] Timing
When LOCK_REF is pulled low, RCLKN should be in
local phase lock with TBC within 500 µs. LOCK_REF,
when activated, shall stay low for a duration of at
least 500 µs if receiver frequency lock is to be ex-
pected. After local phase lock has been acquired,
and when EWRAP is high, 2500 baud times after
LOCK_REF is driven high, RCLKN shall be in phase
lock with REFCLK. After local phase lock has been
acquired, and when EWRAP is low, 250 baud times
after LOCK_REF is driven high, RCLKN shall be in
phase lock with the incoming serial data stream.
Figure 10. RCLKN Timing Diagram
Table 13. Serial Data Input Timing Table (RLX, RLY; RX, RY)
Parameters
Description
Min
Max
Units
Conditions
R
, R
SDF
Serial data input rise and fall
—
—
300
2.4
ps
20% to 80%.
SDR
T
Data acquisition lock time @
<1.0625Gb/s
µs
LOCK
8B/10B IDLE pattern sample basis
—
bit time
Input Jitter
Tolerance
Input data eye opening
allocation at receiver input
for BER ≤1E–12
As specified in Fibre Channel FC–PH
standard eye diagram jitter mask.
(See Figure 12.)
30%
For BER ≤ IE-9 see Figure 14.
May 16, 2000 / Revision NC
18
AMCC [ APPLIED MICRO CIRCUITS CORPORATION ]
