DA70131-1/3E
III-8
1-2. Access timing
1-2-1. Normal access
The center device has 9 address terminals used to access 512 bytes of memory. The access timing for each of
these addresses is shown below.
CPUs that have a wait function can be connected to the
_____
WRQ
terminal on the center device so that they can be
used without special concern for signal timing.
However, CPUs without a wait function must monitor the
____
IFB
output or use one of the following timing schemes
(this is essential).
1-2-1-1. Write to the I/O buffer or the data transfer FIFO
The timing for writing to the I/O buffer (address 4 and 5 when I/F mode 4) or the data transfer FIFO (address 6 and
7 when I/F mode 4) is shown below.
A wait time is necessary to perform continuous writing. The wait must be 4 clock cycles or longer at 40 MHz.
1) Does not use the
_____
WRQ
output (CPU does not have a wait function)
2) Uses the
_____
WRQ
output (CPU has a wait function)
Next address
Data
Data
Address
A wait of 4 clock cycles or longer (at
40 MHz) must be inserted by the
CPU software.
Data
Address
Next address
The CPU automatically waits for the
required period of time.
Data
Address
___
CS
___
WR
DATA
Address
___
CS
___
WR
____
WRQ
DATA
Содержание Motionnet G9001A
Страница 1: ...DA70131 1 3E G9001A G9002A User s Manual Center device I O device Remote I O Remote Motion...
Страница 7: ...DA70131 1 3E I 1 I Center device G9001A User s Manual...
Страница 8: ...DA70131 1 3E I 2...
Страница 50: ...DA70131 1 3E I 44...
Страница 51: ...DA70131 1 3E II 1 II I O device G9002A User s Manual...
Страница 52: ...DA70131 1 3E II 2...
Страница 66: ...DA70131 1 3E II 16...
Страница 67: ...DA70131 1 3E III 1 III Connection Examples and Recommended Environments G9000 Series...
Страница 68: ...DA70131 1 3E III 2...
Страница 87: ...DA70131 1 3E IV 1 IV Software Examples flow chart G9001A...
Страница 88: ...DA70131 1 3E IV 2...