Datasheet

561
SAM9X35 [DATASHEET]
11055E–ATARM–10-Mar-2014
32.7.20 UDPHS Endpoint Status Register (Isochronous Endpoint)
Name: UDPHS_EPTSTAx [x=0..6] (ISOENDPT)
Address: 0xF803C11C [0], 0xF803C13C [1], 0xF803C15C [2], 0xF803C17C [3], 0xF803C19C [4], 0xF803C1BC [5],
0xF803C1DC [6]
Access: Read-only
This register view is relevant only if EPT_TYPE=0x1 in “UDPHS Endpoint Configuration Register” on page 538
• TOGGLESQ_STA: Toggle Sequencing
Toggle Sequencing:
– IN Endpoint: It indicates the PID Data Toggle that will be used for the next packet sent. This is not relative to
the current bank.
– OUT endpoint:
These bits are set by hardware to indicate the PID data of the current bank:
Notes: 1. In OUT transfer, the Toggle information is meaningful only when the current bank is busy (Received OUT Data = 1).
2. These bits are updated for OUT transfer:
-
A new data has been written into the current bank.
- The user has just cleared the Received OUT Data bit to switch to the next bank.
3. For High Bandwidth Isochronous Out endpoint, it is recommended to check the UDPHS_EPTSTAx/TXRDY_TRER bit
to know if the toggle sequencing is correct or not.
4. This field is reset to DATA1 by the UDPHS_EPTCLRSTAx register TOGGLESQ bit, and by UDPHS_EPTCTLDISx
(disable endpoint).
• ERR_OVFLW: Overflow Error
This bit is set by hardware when a new too-long packet is received.
Example: If the user programs an endpoint 64 bytes wide and the host sends 128 bytes in an OUT transfer, then the Overflow
Error bit is set.
This bit is updated at the same time as the BYTE_COUNT field.
This bit is reset by UDPHS_EPTRST register EPT_x (reset endpoint) and by UDPHS_EPTCTLDISx (disable endpoint).
31 30 29 28 27 26 25 24
SHRT_PCKT BYTE_COUNT
23 22 21 20 19 18 17 16
BYTE_COUNT BUSY_BANK_STA CURBK
15 14 13 12 11 10 9 8
– ERR_FLUSH ERR_CRC_NT
R
ERR_FL_ISO TXRDY_TRER TX_COMPLT RXRDY_TXKL ERR_OVFLW
76543210
TOGGLESQ_STA––––––
Value Name Description
0DATA0 DATA0
1DATA1 DATA1
2 DATA2 Data2 (only for High Bandwidth Isochronous Endpoint)
3 MDATA MData (only for High Bandwidth Isochronous Endpoint)