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Timing Controller Register Map
961
SBAU337–May 2020
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Serial Interface Register Maps
2.15.3 Register 84h (offset = 84h) [reset = 0h]
Figure 2-2210. Register 84h
7 6 5 4 3 2 1 0
FB_GATE_MO
DE
R/W-0h
LEGEND: R/W = Read/Write; W = Write only; -n = value after reset
Table 2-2225. Register 84 Field Descriptions
Bit Field Type Reset Description
0-0 FB_GATE_MODE R/W 0h
If this mode is set, FbOn signal is gated using TxOn. This
setting prevents going to FbMode if Tx is not transmitting.
2.15.4 Register 86h (offset = 86h) [reset = 0h]
Figure 2-2211. Register 86h
7 6 5 4 3 2 1 0
MAP_INVALID_SETTINGS
R/W-0h
LEGEND: R/W = Read/Write; W = Write only; -n = value after reset
Table 2-2226. Register 86 Field Descriptions
Bit Field Type Reset Description
1-0
MAP_INVALID_SE
TTINGS
R/W 0h
Map setting in case of invalid inputs in a tdd mode. ie
RX,FB='1'
00- maps to RX=1, FB=0
01- maps to RX=0 FB=1
1x maps to
RX=1, FB=1
Maps invalid settings of Rx/FbEn to valid settings in
conjunction with fields rxa_fb_shr, rxb_fb_shr etc.
Example a): RxA and Fb chains are shared. When RxEn=1,
FbEn=1, we want shared chain to be in Fb mode and non-
shared chain (chB) to be in Rx mode. This can be achieved by
setting rxa_fb_shr=1, rxb_fb_shr=0 and map_invalid_settings
to 01. Since rxa_fb_shr==1, map_invalid_settings will take
effect of chA and set it in Fb mode and since rxb_fb_shr=0,
RxBEn will be left alone and willbe equal to 1
Example b) RxA and Fb chains are shared. When RxEn=1,
FbEn=1, we want shared chain to be in Fb mode and non-
shared chain (chB) to be in Off mode. This can be achieved
by setting rxa_fb_shr=1, rxb_fb_shr=1 and
map_invalid_settings to 01. Since rxa_fb_shr==1,
map_invalid_settings will take effect on chA and set it in Fb
mode and since rxb_fb_shr=1, RxBEn will be made 0
In sum, if we want RxEn to be left alone for a chanel, we
make the corresponding rx_fb_shr = 0 and if we want it to be
affected by the mode based on map_invalid_settings, we
make rx_fb_shr=1
2.15.5 Register 88h (offset = 88h) [reset = 1h]
Figure 2-2212. Register 88h
7 6 5 4 3 2 1 0
RXA_FB_SHR
R/W-1h
LEGEND: R/W = Read/Write; W = Write only; -n = value after reset
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