6-6
MC92603 Quad Gigabit Ethernet Transceiver Reference Manual
MOTOROLA
BIST Sequence Test with Internal Digital Loopback Mode
BIST is run at the speed indicated by the frequency of the reference clock and by the speed
range selected by half-speed mode (HSE). Word sync mode is supported during BIST
testing, however, only the 4-IDLEs/Non-IDLE alignment mode is supported
(WSYNC1 = low and WSYNC0 = high).
The BIST sequence is as follows:
1. Enter test mode by setting the test mode inputs as described in Table 6-4.
2. If COMPAT is low, transmit 4096 IDLEs (K28.5 characters).
If COMPAT is high, an auto-negotiation sequence will occur.
3. Transmit an 8B/10B encoded PN sequence to the receiver as described above.
The transmitter will automatically go through sequences 2 and 3 on entering this test mode.
When testing is complete, the device will need to be reset before normal operation can
resume.
If IDLEs are to be inserted (TST_1 = low, TST_0 = high, XCVR_A_LBE = high), then
IDLEs (K28.5 code group) are inserted every 2048 code groups during sequence 3.
If COMPAT is high, /I1/I2/ code groups will be inserted instead of the IDLE (K28.5) code
group.
6.3
BIST Sequence Test with Internal Digital
Loopback Mode
This test mode is identical to the system BIST sequence test with external loopback mode
described above, except loopback is performed internally to GEt.
NOTE
In this mode, the configuration input LBOE controls whether
serial data is sent on transmit link outputs (XLINK_x_P and
XLINK_x_N). If LBOE is low, the link is quiescent; if LBOE
is high, data is transmitted on the link).
Summary of Contents for MC92603
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