Rainbow Electronics AT91CAP9S250A - Manual (Page 893)

893
6264A–CAP–21-May-07
AT91CAP9S500A/AT91CAP9S250A
44.5.11 UDPHS Endpoint Control Register
Name: UDPHS_EPTCTLx [x=0..7]
Access Type: Read-only
• EPT_ENABL: Endpoint Enable
0 = If cleared, the endpoint is disabled according to the device configuration. Endpoint 0 should always be enabled after a
hardware or UDPHS bus reset and participate in the device configuration.
1 = If set, the endpoint is enabled according to the device configuration.
• AUTO_VALID: Packet Auto-Valid Enabled (Not for CONTROL Endpoints)
Set this bit to automatically validate the current packet and switch to the next bank for both IN and OUT endpoints.
For IN Transfer:
If this bit is set, then the UDPHS_EPTSTAx register TX_PK_RDY bit is set automatically when the current bank is full
and at the end of DMA buffer if the UDPHS_DMACONTROLx register END_B_EN bit is set.
The user may still set the UDPHS_EPTSTAx register TX_PK_RDY bit if the current bank is not full, unless the user
wants to send a Zero Length Packet by software.
For OUT Transfer:
If this bit is set, then the UDPHS_EPTSTAx register RX_BK_RDY bit is automatically reset for the current bank when
the last packet byte has been read from the bank FIFO or at the end of DMA buffer if the UDPHS_DMACONTROLx reg-
ister END_B_EN bit is set. For example, to truncate a padded data packet when the actual data transfer size is reached.
The user may still clear the UDPHS_EPTSTAx register RX_BK_RDY bit, for example, after completing a DMA buffer by
software if UDPHS_DMACONTROLx register END_B_EN bit was disabled or in order to cancel the read of the remain-
ing data bank(s).
• INTDIS_DMA: Interrupt Disables DMA
If set, when an enabled endpoint-originated interrupt is triggered, the DMA request is disabled regardless of the
UDPHS_IEN register EPT_INT_x bit for this endpoint. Then, the firmware will have to clear or disable the interrupt source
or clear this bit if transfer completion is needed.
If the exception raised is associated with the new system bank packet, then the previous DMA packet transfer is normally
completed, but the new DMA packet transfer is not started (not requested).
If the exception raised is not associated to a new system bank packet (NAK_IN, NAK_OUT, ERR_FL_ISO...), then the
request cancellation may happen at any time and may immediately stop the current DMA transfer.
31 30 29 28 27 26 25 24
SHRT_PCKT – – – – – – –
23 22 21 20 19 18 17 16
– – – – – BUSY_BANK – –
15 14 13 12 11 10 9 8
NAK_OUT
NAK_IN/
ERR_FLUSH
STALL_SNT/
ERR_CRISO/
ERR_NBTRA
RX_SETUP/
ERR_FL_ISO
TX_PK_RDY/
ERR_TRANS
TX_COMPLT RX_BK_RDY ERR_OVFLW
7 6 5 4 3 2 1 0
MDATA_RX DATAX_RX – NYET_DIS INTDIS_DMA – AUTO_VALID EPT_ENABL