CY7C68300C, CY7C68301C
CY7C68320C, CY7C68321C
Document 001-05809 Rev. *B Page 20 of 42
MfgCB
The mfg_load and mfg_read vendor-specific commands are
passed down through the bulk pipe in the CBWCB portion of the
CBW. The format of this MfgCB is shown as follows. Byte0 is a
vendor-specific command designator whose value is config-
urable and set in the AT2LP configuration data. Byte 1 must be
0x27 to identify a MfgCB. Bytes 2 through 15 are reserved and
must be set to zero.
The data transfer length is determined by the CBW Data Transfer
Length specified in bytes 8 through 11 (dCBWDataTransfer-
Length) of the CBW. The type and direction of the command is
determined by the direction bit specified in byte 12, bit 7
(bmCBWFlags) of the CBW.
Mfg_load
During a Mfg_load, the AT2LP enters into Manufacturing Test
Mode. Manufacturing Test Mode is provided as a means to
implement board or system level interconnect tests. During
Manufacturing Test Mode operation, all outputs not directly
associated with USB operation are controllable. Normal control
of the output pins are disabled. Control of the select AT2LP I/O
pins and their tri-state controls are mapped to the ATAPI data
packet associated with this request. (See Table 10 for an expla-
nation of the required Mfg_load data format.) Any data length can
be specified, but only bytes 0 through 3 are mapped to pins, so
a length of 4 bytes is recommended. To exit Manufacturing Test
Mode, a hard reset (toggle RESET#) is required.
Mfg_read
This USB request returns a ’snapshot’ of select AT2LP input
pins. AT2LP input pins not directly associated with USB
operation can be sampled at any time during Manufacturing Test
Mode operation. See Table 10 for an explanation of the
Mfg_read data format. Any data length can be specified, but only
bytes 0 through 3 contain usable information, so a length of 4
bytes is recommended.
Table 8. Example CfgCB
Offset CfgCB Byte Descriptions Bits
76543210
0 bVSCBSignature (set in configuration bytes) 00100100
1 bVSCBSubCommand (must be 0x26) 00100110
2 Reserved (must be set to zero) 00000000
3 Data Source (must be set to 0x02) 00000010
4 Start Address (LSB) (must be set to zero) 00000000
5 Start Address (MSB) (must be set to zero) 00000000
6–15 Reserved (must be set to zero) 00000000
Table 9. Example MfgCB
Offset MfgCB Byte Description Bits
76543210
0 0 bVSCBSignature
(set in configuration bytes)
00100100
1 1 bVSCBSubCommand
(hardcoded 0x27)
00100111
2–15 2–15 Reserved (must be zero) 0 0 0 0 0 0 0 0
Table 10. Mfg_read and Mfg_load Data Format
Byte Bits Read/Load Function
0 7 R/L ARESET#
6RDA2
5:4 R/L CS#[1:0]
3 R/L DRVPWRVLD
2:1 R/L DA[1:0]
0RINTRQ
1 7 L DD[15:0] High-Z Status
0 = Hi-Z all DD pins
1 = Drive DD pins
6RMFG_SEL
0 = Mass Storage Mode
1 = Manufacturing Mode
5 R VBUS_ATA_ENABLE
4RDMARQ
3 R IORDY
2R/LDMACK#
1R/LDIOR#
0R/LDIOW#
2 7:0 R/L DD[7:0]
3 7:0 R/L DD[15:8]
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