Normal data transfer (X-side) for nonblocking protocols

Figure 1 shows the data areas associated with the X-side of a normal data transfer channel program for nonblocking protocols.

Sequence	CCW	Command code (hex)	Flags	Address	Byte count
1	WCTL	17/ 14	CC,SLI	Zero	1
Note: WCTL is used when this host is initiating a write operation. SCB is used when this host is responding to an attention (because the other host has data that it wants this host to read).
2	TIC	08	—	WRITE CCW	—
3	Write	01	CC,SLI	XCNOCTL	8
4	TIC Write : :	08 01	— CC,SLI (CD)	WRITE CCW Buffer	— Length of data in this buffer
5	Write : : Write	01 01	CC,SLI, (CD) CC,SLI	Buffer Buffer	Length of data in this buffer Length of data in this buffer

6	TIC	08	—	READ CCW	—
7	Read	02	CC,SLI	XCNICTL	8
8	TIC	08	—	READ CCW	—
	Read	02	CC,SLI	Address of Data	Length of data in this buffer
9	TIC : : Read	08 02	— CC,SLI	READ CCW Address of Data	— Length of data in this buffer
	TIC	08	—	WRITE CCW	—
10	Write	01	CC,SLI	XCNOVTXT	4

Figure 1. Data areas used for normal data transfer (X-side) nonblocking