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DP83848JSQ bảng dữ liệu(PDF) 58 Page - Texas Instruments

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DP83848JSQ bảng dữ liệu(HTML) 58 Page - Texas Instruments

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7.2.9 CD Test and BIST Extensions Register
(CDCTRL1)
Table 29. CD Test and BIST Extensions Register (CDCTRL1), address 0x1B
Bit
Bit Name
Default
Description
15:8
BIST_ERROR_CO
UNT
0, RO
BIST ERROR Counter:
Counts number of errored data nibbles during Packet BIST. This
value will reset when Packet BIST is restarted. The counter sticks
when it reaches its max count.
7:6
RESERVED
0, RW
RESERVED:
Must be zero.
5
BIST_CONT_MOD
E
0, RW
Packet BIST Continuous Mode:
Allows continuous pseudo random data transmission without any
break in transmission. This can be used for transmit VOD testing.
This is used in conjunction with the BIST controls in the PHYCR
Register (0x19h). For 10Mb operation, jabber function must be dis-
abled, bit 0 of the 10BTSCR (0x1Ah), JABBER_DIS = 1.
4
CDPATTEN_10
0, RW
CD Pattern Enable for 10Mb:
1 = Enabled.
0 = Disabled.
3
RESERVED
0, RW
RESERVED:
Must be zero.
2
10MEG_PATT_GA
P
0, RW
Defines gap between data or NLP test sequences:
1 = 15
µs.
0 = 10
µs.
1:0
CDPATTSEL[1:0]
00, RW
CD Pattern Select[1:0]:
If CDPATTEN_10 = 1:
00 = Data, EOP0 sequence
01 = Data, EOP1 sequence
10 = NLPs
11 = Constant Manchester 1s (10MHz sine wave) for harmonic dis-
tortion testing.



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