參數(shù)資料
型號(hào)： CY7C63231-PC
廠商： CYPRESS SEMICONDUCTOR CORP
元件分類(lèi)： 微控制器/微處理器
英文描述： enCoRe USB Low-speed USB Peripheral Controller
中文描述： 8-BIT, OTPROM, RISC MICROCONTROLLER, PDIP18
封裝： 0.300 INCH, PLASTIC, DIP-18
文件頁(yè)數(shù)： 36/49頁(yè)
文件大?。?/td> 960K
代理商： CY7C63231-PC
FOR
FOR
enCoRe
USB
CY7C63221/31A
Document #: 38-08028 Rev. *A
Page 36 of 49
20.0
The following tables give details on mode setting for the USB Serial Interface Engine (SIE) for both the control endpoint (EP0)
and non-control endpoint (EP1).
USB Mode Tables
Note:
3.
STALL bit is the bit 7 of the USB Non-Control Device Endpoint Mode registers. Refer to Section 14.3 for more explanation.
Mode Column:
The
’
Mode
’
column contains the mnemonic names given to the modes of the endpoint. The mode of the endpoint is determined
by the 4 bit binaries in the
’
Encoding
’
column as discussed below. The Status IN and Status OUT modes 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 (
Figure 14-2
and
Figure 14-
3
). 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 (
Figure 14-2
) are set to
’
0001
’
, which is NAK IN/OUT mode as shown in
Table 20-1 above, the SIE of the part will send an ACK handshake in response to SETUP tokens and NAK any IN or OUT tokens.
For more information on the functionality of the Serial Interface Engine (SIE), see Section 13.0.
SETUP, IN, and OUT Columns:
Depending on the mode specified in the
’
Encoding
’
column, the
’
SETUP
’
,
’
IN
’
, and
’
OUT
’
columns contain the device 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 conditions 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. Table 20-3 gives detailed analysis of all possible cases.
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 (
Figure 14-4
) in response to any IN token.
Table 20-1. USB Register Mode Encoding for Control and Non-Control Endpoint
Mode
Encoding
0000
0001
SETUP
Ignore
Accept
IN
OUT
Ignore
NAK
Comments
Ignore all USB traffic to this endpoint
On Control endpoint, after successfully sending an ACK
handshake to a SETUP packet, the SIE forces the
endpoint mode (from modes other than 0000) to 0001.
The mode is also changed by the SIE to 0001 from mode
1011 on issuance of ACK handshake to an OUT.
For Control endpoints
For Control endpoints
For Control endpoints
Reserved
For Control Endpoints
Reserved
In mode 1001, after sending an ACK handshake to an
OUT, the SIE changes the mode to 1000
This mode is changed by the SIE to mode 1000 on
issuance of ACK handshake to an OUT
Disable
NAK IN/OUT
Ignore
NAK
Status OUT Only
STALL IN/OUT
Ignore IN/OUT
Reserved
Status IN Only
Reserved
NAK OUT
0010
0011
0100
0101
0110
0111
1000
Accept
Accept
Accept
Ignore
Accept
Ignore
Ignore
STALL
STALL
Ignore
Ignore
TX 0 Byte
TX Count
Ignore
Check
STALL
Ignore
Always
STALL
Ignore
NAK
ACK OUT(
STALL
[3]
= 0)
ACK OUT
(STALL
[3]
= 1)
NAK OUT - Status IN
ACK OUT - NAK IN
1001
1001
1010
1011
Ignore
Ignore
Accept
Accept
Ignore
Ignore
TX 0 Byte
NAK
ACK
STALL
NAK
ACK
This mode is changed by the SIE to mode 0001 on
issuance of ACK handshake to an OUT
An ACK from mode 1101 changes the mode to 1100
This mode is changed by the SIE to mode 1100 on
issuance of ACK handshake to an IN
An ACK from mode 1111 changes the mode to 1110
This mode is changed by the SIE to mode 1110 on
issuance of ACK handshake to an IN
NAK IN
ACK IN
(STALL
[3]
=0)
ACK IN(
STALL
[3]
=1)
NAK IN - Status OUT
ACK IN - Status OUT
1100
1101
1101
1110
1111
Ignore
Ignore
Ignore
Accept
Accept
NAK
Ignore
Ignore
Ignore
Check
Check
TX Count
STALL
NAK
TX Count
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