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6.5.4 V
4120A processing at data transmitting
R
This section explains the processing performed by the V
(1)
(2)
Reads U SB Command R egister
(3)
(4)
(5)
(7)
Reads U SB G eneral Status Register
(8)
(9)
Reads register (TM RA) which addresses
(10)
(11)
Updates read pointer of mailbox
338
CHAPTER 6 USB CONTROLLER
Figure 6-7. V
4120A Processing at Data Transmitting
R
Prepare Tx data
in the memory
Busy bit = "1" ?
No
Reads U SB Tx EndP oint
Status Register
EndPoint is B usy ?
No
(6)
Issues transmit
comm and
End of transmission ?
Yes
transmit mailbox
Reads T x indication
Preliminary User's Manual S15543EJ1V0UM
4120A when transmitting data.
R
Yes
Issue processing of T x
comm and
Yes
US B Controller
transmits the data
to USB .
No
Read processing of T x
indication
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