NEC Network Controller uPD98502 - Manual (Page 326)

CHAPTER 6 USB CONTROLLER
326 Preliminary User’s Manual S15543EJ1V0UM
6.2.17 U_TEPSR (USB Tx EndPoint Status Register)
This register is used for indicate the status of the EndPoint being used for data transmitting.
Bits Field R/W Default Description
31:26 Reserved R 0 Reserved for future use
25:24 EP5TS R 0 EP5 Tx Status:
Register that indicates the transmit status of EndPoint5
This register is not cleared, even if read.
00: There is no data scheduled to be sent (Idle)
01: There is one data item scheduled to be sent
10: There are two data items that are scheduled to be sent (Busy)
23:18 Reserved R 0 Reserved for future use
17:16 EP3TS R 0 EP3 Tx Status:
Register that indicates the transmit status of EndPoint3
This register is not cleared, even if read.
00: There is no data scheduled to be sent (Idle)
01: There is one data item scheduled to be sent
10: There are two data items that are scheduled to be sent (Busy)
15:10 Reserved R 0 Reserved for future use
9:8 EP1TS R 0 EP1 Tx Status:
Register that indicates the transmit status of EndPoint1
This register is not cleared, even if read.
00: There is no data scheduled to be sent (Idle)
01: There is one data item scheduled to be sent
10: There are two data items that are scheduled to be sent (Busy)
7:2 Reserved R 0 Reserved for future use
1:0 EP0TS R 0 EP0 Tx Status:
Register that indicates the transmit status of EndPoint0
This register is not cleared, even if read.
00: There is no data scheduled to be sent (Idle)
01: There is one data item scheduled to be sent
10: There are two data items that are scheduled to be sent (Busy)
6.2.18 U_RP0IR (USB Rx Pool0 Information Register)
This register indicates the information of Receive Pool0.
The V R 4120A writes to this register only when the device is being initialized.
Bits Field R/W Default Description
31 Reserved R/W 0 Reserved for future use. Writes ‘0’s.
30:28 AL R/W 000 Alert Level:
Sets the warning level for Pool0. When the number of Buffer Directories
remaining in this pool equals the value set in this field, USB Controller sets
the RPA0 bit in the USB General Status Register1 to a ‘1’.
Writing N in this field is equivalent to specifying N x 4 (remaining number of
Buffer Directories = 4, 8, 12, …, 28). When 000 is written into this field, this
function is disabled and no notification is posted to the V R 4120A.
27:16 Reserved R/W 0 Reserved for future use. Writes ‘0’s.
15:0 RNOD R 0 Remaining Number of Buffer Directory:
Indicates the number of Buffer Directories remaining in Pool0. The V
R
4120A
can only read this field.
Buffer Directory addition is performed entirely using the USB Command
Register.