Analog Devices Advantiv ADV7611 Hardware User's Manual page 143

Hardware User Guide
Receive Buffers
The ADV7611 features three frame buffers that allow the receiver to receive up to three messages before the host processor needs to read
a message out. When three messages have been received, no further message reception is possible until the host reads at least one
message.
Note that for backwards compatibility with previous generation ADI CEC-enabled parts, only one frame buffer is enabled by default. In
this default mode, after a message is received, the host processor must read the message out before any further message reception is
possible. The decision to use one or three messages buffers is controlled by the CEC_USE_ALL_BUFS bit.
CEC_USE_ALL_BUFS , Addr 80 (CEC), Address 0x77[0]
Control to enable supplementary receiver frame buffers.
Function
CEC_USE_ALL_BUFS
0 (default)
1
For each of the frame buffers there is a corresponding two-bit time stamp and a raw flag.
CEC_BUF0_TIMESTAMP[1:0] , Addr 80 (CEC), Address 0x53[1:0] (Read Only)
Time stamp for frame stored in Receiver Frame Buffer 0. This can be used to determine which frame should be read next from the
receiver frame buffers.
Function
CEC_BUF0_TIMESTAMP[1:0]
00 (default)
01
10
11
CEC_BUF1_TIMESTAMP[1:0] , Addr 80 (CEC), Address 0x53[3:2] (Read Only)
Time stamp for frame stored in Receiver Frame Buffer 1. This can be used to determine which frame should be read next from the
receiver frame buffers.
Function
CEC_BUF1_TIMESTAMP[1:0]
00 (default)
01
10
11
CEC_BUF2_TIMESTAMP[1:0] , Addr 80 (CEC), Address 0x53[5:4] (Read Only)
Time stamp for frame stored in Receiver Frame Buffer 2. This can be used to determine which frame should be read next from the
receiver frame buffers.
Function
CEC_BUF2_TIMESTAMP[1:0]
00 (default)
01
10
11
Description
Use only buffer 0 to store CEC frames
Use all 3 buffers to stores the CEC frames
Description
Invalid timestamp, no frame is available in this frame buffer
Of the frames currently buffered, this frame was the first to be received
Of the frames currently buffered, this frame was the second to be received
Of the frames currently buffered, this frame was the third to be received
Description
Invalid timestamp, no frame is available in this frame buffer
Of the frames currently buffered, this frame was the first to be received
Of the frames currently buffered, this frame was the second to be received
Of the frames currently buffered, this frame was the third to be received
Description
Invalid timestamp, no frame is available in this frame buffer
Of the frames currently buffered, this frame was the first to be received
Of the frames currently buffered, this frame was the second to be received
Of the frames currently buffered, this frame was the third to be received
Rev. A | Page 143 of 184
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