Datasheet

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26.3.2.9.4 Read Header Section Register 3 (RDHS3)
Figure 26-189 and Table 26-168 illustrate this register.
Figure 26-189. Read Header Section Register 3 (RDHS3) [offset_CC = 708h]
31 30 29 28 27 26 25 24 23 22 21 16
Reserved RES PPI NFI SYN SFI RCI Reserved RCC
R-0 R-0 R-0 R-0 R-0 R-0 R-0 R-0 R-0
15 11 10 0
Reserved DP
R-0 R/W-0
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 26-168. Read Header Section Register 3 (RDHS3) Field Descriptions
Bit Field Value Description
31-30 Reserved 0 Read returns 0. Writes have no effect.
29 RES 0-1 Reserved bit. Reflects the state of the received reserved bit. The reserved bit is transmitted as 0.
28 PPI Payload preamble indicator. The payload preamble indicator defines whether a network management
vector or message ID is contained within the payload segment of the received frame.
0 The payload segment of the received frame does not contain a network management vector or a
message ID.
1 Static segment: Network management vector at the beginning of the payload.
Dynamic segment: Message ID at the beginning of the payload.
27 NFI Null frame indicator. Is set to 1 after storage of the first received data frame.
0 Up to now no data frame has been stored into the respective message buffer
1 At least one data frame has been stored into the respective message buffer
26 SYN Sync frame indicator. A sync frame is marked by the sync frame indicator.
0 The received frame is not a sync frame
1 The received frame is a sync frame
25 SFI Startup frame indicator. A startup frame is marked by the startup frame indicator.
0 The received frame is not a startup frame
1 The received frame is a startup frame
24 RCI Received on channel indicator. Indicates the channel from which the received data frame was taken to
update the respective receive buffer.
0 Frame received on channel B
1 Frame received on channel A
23-22 Reserved 0 Read returns 0. Writes have no effect.
21-16 RCC Receive cycle count. Cycle counter value updated from received frame.
15-11 Reserved 0 Read returns 0. Writes have no effect.
10-0 DP Data pointer. Pointer to the first 32-bit word of the data section of the addressed message buffer in the
message RAM.
NOTE: Header 3 is updated from data frames only.
1352
FlexRay Module SPNU563–May 2014
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