Frames Supported - STMicroelectronics SPC572L series Reference Manual

LVDS Fast Asynchronous Serial Transmission (LFAST) – Interprocessor Communications
1
RX_CLK
RX_FIFO_WE
RX_FIFO_RE
FILLED_SPACE 0
CTS
47.7.5

Frames supported

Table 686
Frame Type
Data Frame
Unsolicited
Frame
ICLC Frame
CTS Frame
Reserved
1. Except the ICLC PING response frame.
If logical channel type (LCT) code other than the above mentioned are received then the
interrupt flag RISR[RXLCEF] = 1. If the payload size received does not match any value in
Table 686
is ignored. The S/W may have to take the necessary steps to recover from such an error.
47.7.6 Frame flow
Following sections describe Data Frame Flow, ICLC Flow and Rx Unsolicited Data Flow.
47.7.6.1 Data flow
LFAST supports the transfer of data between master and slave LFAST devices.
47.7.6.1.1 Data transmit
System Side Module is the initiator of all the Tx data frame to LFAST peer device. Data
frame transmit is triggered whenever the Tx Data FIFO has at least one valid frame. The
1270/2058
Figure 675. CTS generation
2 3 4
....
RX_CTS_MIN
provides the frames supported and their permissible payload sizes
Table 686. Frames supported by LFAST interfaces
LCT Code 1. LFAST Master Tx
0100b – 1011b
0001b
0000b
0011b
All others
then the flag RISR[RXSZF] = 1. In both these error conditions the received frame
DocID027809 Rev 4
5 6
.... ....
RX_CTS_MAX
Supported by
1. LFAST Slave Tx
2. LFAST Slave Rx 2. LFAST Master Rx
YES
YES
YES
YES
—
7 8
.... ....
Supported by
Payload Size
32, 64, 96, 128, 256,
YES
288
8, 32, 64, 96, 128,
YES
256 and 288
(1)
NO
YES
—
9 10
RX_CTS_MIN
(bits)
8
8
—