Texas Instruments TMS320DM357 - Manual (Page 120)

4.57 Control Status Register for Endpoint 0 in Peripheral Mode (PERI_CSR0)
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The Control Status Register for Endpoint 0 in Peripheral Mode (PERI_CSR0) is shown in Figure 72 and
described in Table 73 .
Figure 72. Control Status Register for Endpoint 0 in Peripheral Mode (PERI_CSR0)
15 9 8
Reserved FLUSHFIFO
R-0 W-0
7 6 5 4 3 2 1 0
SERV_SETUPEND SERV_RXPKTRDY SENDSTALL SETUPEND DATAEND SENTSTALL TXPKTRDY RXPKTRDY
W-0 W-0 W-0 R-0 W-0 R/W-0 R/W-0 R-0
LEGEND: R/W = Read/Write; R = Read only; W = Write only; -n = value after reset
Table 73. Control Status Register for Endpoint 0 in Peripheral Mode (PERI_CSR0)
Field Descriptions
Bit Field Value Description
15-9 Reserved 0 Reserved
8 FLUSHFIFO 0-1 Set this bit to flush the next packet to be transmitted/read from the Endpoint 0 FIFO. The FIFO
pointer is reset and the TXPKTRDY/RXPKTRDY bit is cleared.
Note: FLUSHFIFO has no effect unless TXPKTRDY/RXPKTRDY is set.
7 SERV_SETUPEND 0-1 Set this bit to clear the SETUPEND bit. It is cleared automatically.
6 SERV_RXPKTRDY 0-1 Set this bit to clear the RXPKTRDY bit. It is cleared automatically.
5 SENDSTALL 0-1 Set this bit to terminate the current transaction. The STALL handshake will be transmitted and
then this bit will be cleared automatically.
4 SETUPEND 0-1 This bit will be set when a control transaction ends before the DATAEND bit has been set. An
interrupt will be generated, and the FIFO will be flushed at this time. The bit is cleared by the
writing a 1 to the SERV_SETUPEND bit.
3 DATAEND 0-1 Set this bit to:
1 - When setting TXPKTRDY for the last data packet
2 - When clearing RXPKTRDY after unloading the last data packet
3 - When setting TXPKTRDY for a zero length data packet. It is cleared automatically.
2 SENTSTALL 0-1 This bit is set when a STALL handshake is transmitted. This bit should be cleared.
1 TXPKTRDY 0-1 Set this bit after loading a data packet into the FIFO. It is cleared automatically when the data
packet has been transmitted. An interrupt is generated (if enabled) when the bit is cleared.
0 RXPKTRDY 0-1 This bit is set when a data packet has been received. An interrupt is generated when this bit is set.
This bit is cleared by setting the SERV_RXPKTRDY bit.
Universal Serial Bus (USB) Controller 120 SPRUGH3 – November 2008
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