Toshiba H1 Series, TLCS-900, TMP92CZ26AXBG TMP92CZ26A , 92CZ26A-447

TMP92CZ26A
92CZ26A-447
(c) Issuance of NULL packet
If transmitting NULL packet, by input L pulse from EPx_EOPB signal, data of 0
length is set to FIFO, and it can be transferred NULL packet to IN tok en.
But if it set NULL data to FIFO, it is valid only case of SET signal is L level
condition (case o f FIFO is empty). If it answer to receivin g IN token by using NULL
packet in a certain period , it is answered by keeping EPx_ EOPB signal to L l evel.
However, if mode is dual packet mode, EPx_DATASET signal assert L level for
showing space of data. Therefore, data condition (both data have not data) cannot
be confirmed from external.
Note: NULL pack et can be set also accessing EOP register.
Example:
(2) Interrupt control
Interrupt signal is prepared. This function use adept system.
Detail refers to 3.10.2 900/H1 CPU I/F.
DATASET_A
DATASET
_
B
EPx_EOPB
NULL
A
Neglect NULL
B
NULL
A
NULL
B
NULL
A
NULL packet
completion of
transmitting