Ethernet MAC
UG0331 User Guide Revision 15.0 433
Table 433 • JITTER DIAGNOSTICS
Bit Number Name Reset Value Description
15 JITTER
DIAGNOSTIC
ENABLE
0x0 Set this bit to enable the M-SGMII to transmit the jitter test patterns
defined in IEEE 802.3z 36A. Clear this bit to enable normal transmit
operation.
[14:12] JITTER
PATTERN
SELECT
0x0 Selects the jitter pattern to be transmitted in Diagnostics mode.
Encoding of this field is shown in the following table:
Jitter Pattern Select Bit 14 Bit 13 Bit 12
User defined custom pattern 0 0 0
Annex 36A defined high
frequency
00 1
Annex 36A defined mixed
frequency
01 0
Custom defined low frequency 0 1 1
Random jitter pattern 1 0 0
Annex 36A defined low
frequency
10 1
Reserved 1 1 0
Reserved 1 1 1
[11:10] Reserved 0x0 Reserved
[9:0] CUSTOM
JITTER
PATTERN
0x0 Used in conjunction with JITTER PATTERN SELECT and JITTER
DIAGNOSTIC ENABLE. Set this field to the desired custom pattern,
which is transmitted continuously.
Table 434 • TBI CONTROL
Bit Number Name Reset Value Description
15 SOFT RESET 0x0 This bit resets the functional modules in the M-SGMII. Clear it for
normal operation. Its default is ‘0’.
14 SHORTCUT LINK
TIMER
0x0 Set this bit to reduce the amount of simulation time needed to
time the 1.6ms Link Timer. Clear it for normal operation.
13 DISABLE
RECEIVE
RUNNING
DISPARITY
0x0 Set this bit to disable the running disparity calculation and
checking in the receive direction. This bit must be ‘0’ for correct
M-SGMII operation.
12 DISABLE
TRANSMIT
RUNNING
DISPARITY
0x0 Set this bit to disable the running disparity calculation and
checking in the transmit direction. This bit must be ‘0’ for correct
M-SGMI operation.
[11:9] Reserved 0x0 Reserved
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