CY7C63923-PVXC Datasheet, PDF (51/68 Pages) Cypress Semiconductor – enCoRe™ II Low-Speed USB Peripheral Controller

22.0 USB Mode Tables
Mode
DISABLE
Encoding
0000
NAK IN/OUT
STATUS OUT ONLY
STALL IN/OUT
STATUS IN ONLY
0001
0010
0011
0110
ACK OUT – STATUS
IN
ACK IN – STATUS
OUT
1011
1111
CY7C63310
CY7C638xx
CY7C639xx
SETUP
Ignore
Accept
Accept
Accept
Accept
Accept
Accept
IN
Ignore
NAK
STALL
STALL
TX0 byte
TX0 byte
TX Count
OUT
Ignore
NAK
Check
STALL
STALL
ACK
Check
Comments
Ignore all USB traffic to this endpoint. Used by Data and
Control endpoints
NAK IN and OUT token. Control endpoint only
STALL IN and ACK zero byte OUT. Control endpoint only
STALL IN and OUT token. Control endpoint only
STALL OUT and send zero byte data for IN token. Con-
trol endpoint only
ACK the OUT token or send zero byte data for IN token.
Control endpoint only
Respond to IN data or Status OUT. Control endpoint only
NAK OUT
ACK OUT (STALL = 0)
1000
1001
ACK OUT (STALL = 1)
NAK IN
ACK IN (STALL = 0)
1001
1100
1101
ACK IN (STALL = 1)
1101
Ignore
Ignore
Ignore
Ignore
Ignore
Ignore
Ignore
Ignore
Ignore
NAK
TX Count
STALL
NAK
ACK
STALL
Ignore
Ignore
Ignore
Send NAK handshake to OUT token. Data endpoint only
This mode is changed by the SIE to mode 1000 on is-
suance of ACK handshake to an OUT. Data endpoint
only
STALL the OUT transfer
Send NAK handshake for IN token. Data endpoint only
This mode is changed by the SIE to mode 1100 after
receiving ACK handshake to an IN data. Data endpoint
only
STALL the IN transfer. Data endpoint only
Reserved
Reserved
Reserved
Reserved
Reserved
0101
0111
1010
0100
1110
Ignore
Ignore
Ignore
Ignore
Ignore
Ignore
Ignore
Ignore
Ignore
Ignore
Mode Column
The ’Mode’ column contains the mnemonic names given to the
modes of the endpoint. The mode of the endpoint is deter-
mined by the four-bit binaries in the ’Encoding’ column as
discussed below. The Status IN and Status OUT represent the
status IN or OUT stage of the control transfer.
Encoding Column
The contents of the ’Encoding’ column represent the Mode Bits
[3:0] of the Endpoint Mode Registers (Table 21-3 and
Table 21-4). The endpoint modes determine how the SIE
responds to different tokens that the host sends to the
endpoints. For example, if the Mode Bits [3:0] of the Endpoint
0 Mode Register are set to ’0001’, which is NAK IN/OUT mode,
the SIE will send an ACK handshake in response to SETUP
tokens and NAK any IN or OUT tokens.
Ignore
Ignore
Ignore
Ignore
Ignore
These modes are not supported by SIE. Firmware
should not use this mode in Control and Data endpoints
SETUP, IN, and OUT Columns
Depending on the mode specified in the ’Encoding’ column,
the ’SETUP’, ’IN’, and ’OUT’ columns contain the SIE’s
responses when the endpoint receives SETUP, IN, and OUT
tokens, respectively.
A ’Check’ in the Out column means that upon receiving an
OUT token the SIE checks to see whether the OUT is of zero
length and has a Data Toggle (Data1/0) of 1. If these condi-
tions are true, the SIE responds with an ACK. If any of the
above conditions is not met, the SIE will respond with either a
STALL or Ignore.
A ’TX Count’ entry in the IN column means that the SIE will
transmit the number of bytes specified in the Byte Count Bit
[3:0] of the Endpoint Count Register (Table 21-2) in response
to any IN token.
Document 38-08035 Rev. *E
Page 51 of 68