NEC Network Controller uPD98502 - Manual (Page 324)

CHAPTER 6 USB CONTROLLER
324 Preliminary User’s Manual S15543EJ1V0UM
6.2.13 U_EP5CR (USB EP5 Control Register)
This register is used for setting the operation of EndPoint5.
If the value in the MAXP field is rewritten during transmitting operation, the operation of USB Controller may
become unpredictable. Therefore, the MAXP can be written only when initial setting is being performed.
Bits Field R/W Default Description
31 EP5EN R/W 0 EndPoint Enable:
When the V R 4120A sets this bit to a ‘1’, EndPoint5 is enabled to transmit
data.
30:20 Reserved R/W 0 Reserved for future use. Writes ‘0’s.
19 FM R/W 0 Feedback Mode:
When the V
R
4120A sets this bit to a ‘1’, EndPoint5 performs in feedback
mode.
(For further information about Feedback mode, please refer to USB
Specification 1.1)
18 SS5 R/W 0 Transmit Stall:
When the V R 4120A sets this bit to a ‘1’, a STALL handshake is performed at
EndPoint5.
17 Reserved R/W 0 Reserved for future use. Writes ‘0’s.
16 NAK5 R/W 0 When the V
R
4120A sets this bit to a ‘1’, a NAK Handshake is performed at
EndPoint5.
15:7 Reserved R/W 0 Reserved for future use. Writes ‘0’s.
6:0 MAXP5 R/W 0 MAX Packet size:
The Max Packet Size for EndPoint5. Prior to the start of a USB transaction,
the V R 4120A must set an appropriate value into this register.
6.2.14 U_EP6CR (USB EP6 Control Register)
This register is used for setting the operation of EndPoint6.
If the value in the MAXP field is rewritten during receiving operation, the operation of USB Controller may become
unpredictable. Therefore, the MAXP can be written only when initial setting is being performed.
Bits Field R/W Default Description
31 EP6EN R/W 0 EndPoint Enable:
When the V
R
4120A sets this bit to a ‘1’, EndPoint6 is enabled to receive data.
30:19 Reserved R/W 0 Reserved for future use. Writes ‘0’s.
18 SS6 R/W 0 Transmit Stall:
When the V
R
4120A sets this bit to a ‘1’, a STALL handshake is performed at
EndPoint6.
17 NHSK6 R/W 0 No Handshake:
When the V R 4120A sets this bit to a ‘1’, No Handshake is performed at
EndPoint6.
16 NAK6 R/W 0 When the V R 4120A sets this bit to a ‘1’, a NAK Handshake is performed at
EndPoint6.
15:7 Reserved R/W 0 Reserved for future use. Writes ‘0’s.
6:0 MAXP6 R/W 0 MAX Packet size:
The Max Packet Size for EndPoint6. Prior to the start of a USB transaction,
the V R 4120A must set an appropriate value into this register.