ML60851C Datasheet, PDF (15/67 Pages) OKI electronic componets – USB Device Controller

1Semiconductor
PEDL60851C-02
ML60851C
End Point Packet Ready Register (PKTRDY)
This register indicates whether or not the preparations for reading out or writing in a packet data have been
completed. In addition, this register is also used for controlling the handshake packet (ACK/NAK)
Read address
C8h
Write address
48h
D7 D6 D5 D4 D3 D2 D1 D0
After a hardware reset 0
0
0
0
0
0
0
0
After a bus reset
0
0
0
0
0
0
0
0
Definition
0
EP0 Receive packet ready (R/Reset)
EP1 Receive packet ready (R/Reset)
EP2 Receive packet ready (R/Reset)
EP0 Transmit packet ready (R/Set)
EP1 Transmit packet ready (R/Set)
EP2 Transmit packet ready (R/Set)
EP3 Transmit packet ready (R/Set)
This is the register for indicating that the local MCU can request a read/write of the FIFO for each EP. The logical
sums (AND) of each of these bits and the corresponding bits of INTENBL become the bits of INTSTAT.
The ML60851C asserts a receive packet ready bit (set to “0”) and generates an interrupt cause. The local MCU
resets the receive packet ready bit after completion of the interrupt servicing (such as taking out data from the
corresponding receive FIFO, etc.,).
The ML60851C deasserts a transmit packet ready bit and generates an interrupt cause. The local MCU sets the
receive packet ready bit after completion of the interrupt servicing (such as writing data in the corresponding
transmit FIFO, etc.,).
The bit D3 is fixed at “0”, and even if a “1” is written in this bit, that write operation will be invalid.
The operations of the different bits of PKTRDY are described in detail below.
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