Cypress specifications CY7C68300C/CY7C68301C CY7C68320C/CY7C68321C, MfgCB

CY7C68300C/CY7C68301C

CY7C68320C/CY7C68321C

Table 8. Example CfgCB

Offset	CfgCB Byte Descriptions					Bits
		7	6	5	4		3	2	1	0
0	bVSCBSignature (set in configuration bytes)	0	0	1	0		0	1	0	0
1	bVSCBSubCommand (must be 0x26)	0	0	1	0		0	1	1	0
2	Reserved (must be set to zero)	0	0	0	0		0	0	0	0
3	Data Source (must be set to 0x02)	0	0	0	0		0	0	1	0
4	Start Address (LSB) (must be set to zero)	0	0	0	0		0	0	0	0
5	Start Address (MSB) (must be set to zero)	0	0	0	0		0	0	0	0
6–15	Reserved (must be set to zero)	0	0	0	0		0	0	0	0

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 configurable 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 (dCBWDataTransferLength) 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.

Table 9. Example MfgCB

Offset		MfgCB Byte Description				Bits
			7	6	5	4	3	2	1	0
0	0	bVSCBSignature	0	0	1	0	0	1	0	0
		(set in configuration bytes)
1	1	bVSCBSubCommand	0	0	1	0	0	1	1	1
		(hardcoded 0x27)
2–15	2–15 Reserved (must be zero)		0	0	0	0	0	0	0	0

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 IO pins and their tri-state controls are mapped to the ATAPI data packet associated with this request. (See Table 10 for an explanation 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 10.Mfg_read and Mfg_load Data Format

Byte	Bits	Read/Load	Function
0	7	R/L	ARESET#
	6	R	DA2
	5:4	R/L	CS#[1:0]
	3	R/L	DRVPWRVLD
	2:1	R/L	DA[1:0]
	0	R	INTRQ
1	7	L	DD[15:0] High-Z Status
			0 = Hi-Z all DD pins
			1 = Drive DD pins
	6	R	MFG_SEL
			0 = Mass Storage Mode
			1 = Manufacturing Mode
	5	R	VBUS_ATA_ENABLE
	4	R	DMARQ
	3	R	IORDY
	2	R/L	DMACK#
	1	R/L	DIOR#
	0	R/L	DIOW#
2	7:0	R/L	DD[7:0]
3	7:0	R/L	DD[15:8]

Document 001-05809 Rev. *A Page 20 of 42

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