BU7964GUW_1 Datasheet, PDF (9/19 Pages) Rohm – Data rate 1350Mbps RGB Interface

BU7964GUW
Technical Note
●Link Error Detection
Detection of Parity Error
BU7964GUW counts the number of ‘H’ bits in PD[26:0] and CP in every pixel information received and detects parity error
as follows:
・There is no parity error occurred if the number of ‘H’ bits in PD[26:0] and CP is odd.
・There is parity error occurred if the number of ‘H’ bits in PD[26:0] and CP is even.
If parity error is detected, BU7964GUW outputs the previous error-free pixel information and discards the invalid pixel
information. At the same time, BU7964GUW toggles CPO during one PCLK period. BU7964GUW outputs initial value, if
the parity error is detected when there is no previous pixel information. Otherwise, BU7964GUW outputs the received
pixel information from the high-speed data channel(s) and CPO keeps ‘L.’
Error correction is not supported in BU7964GUW.
●High-Speed Data Channel Protocols
Fig.6 Fig.7 and Fig.8 show high-speed data channel protocols.
D0channel CP PD26 PD25 PD24 PD23 PD22 PD21 PD20 PD19 PD18 PD17 PD16 PD15 PD14 PD13 PD12
CLK channel
Frame start / end
PD11 PD10 PD9 PD8 PD7 PD6 PD5 PD4 PD3 PD2 PD1 PD0 res res CP PD26 PD25
Fig.6. MSDL3 Protocol for 1-channel Data (27-bit)
D0channel ^{CP PD26 PD25 PD24 PD23 PD22 PD21 PD20 PD19 PD18 PD17 PD16 PD15 PD2 res}
CP PD26
D1channel ^{res PD14 PD13 PD12 PD11 PD10 PD9 PD8 PD7 PD6 PD5 PD4 PD3 PD1 PD0 res PD14}
CLK channel
Frame start / end
Fig.7. MSDL3 Protocol for 2-channel Data (27-bit)
D0channel CP PD26 PD25 PD24 PD23 PD22 PD21 PD20 PD19 PD2 CP PD26
D1channel res PD18 PD17 PD16 PD15 PD14 PD13 PD12 PD11 PD1 res PD18
D2channel res PD10 PD9 PD8 PD7 PD6 PD5 PD4 PD3 PD0 res PD10
CLK channel
Frame start / end
Fig.8. MSDL3 Protocol for 3-channel Data (27-bit)
“res” is reserved bit for the future use, the default state of those is ‘0.’
CP is the parity bit of data payload.
BU7964GUW adds an odd parity on CP of the high-speed channel data.
・When the number of ‘H’ bits in parallel data is even, CP bit is ‘H.’
・When the number of ‘H’ bits in parallel data is odd, CP bit is ‘L.’
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9/18
2010.04 - Rev.A