U_Gsr2 (Usb General Status Register 2) - NEC uPD98502 User Manual

6.2.6 U_GSR2 (USB General Status Register 2)

This register indicates the current status of USB Controller. Reading this register clears all bits in this register.
Bits Field
31:21 Reserved
21 FW
20 IFN
19 IEA
18 URSM
17 URST
16 USPD
15:8 Reserved
7 EP2OS
6 EP2ED
5 EP2ND
4 EP1NT
3 EP1ET
2 EP1ND
1 ES
0 SL
318
CHAPTER 6 USB CONTROLLER
R/W Default
R 0 Reserved for future use
RC 0 Frame Number Written:
This bit is set to a '1' when Frame Number is written to USB Frame
Number/Version Register (04H).
RC 0 Incorrect Frame Number:
This bit is set to a '1' when USB Controller receives a SOF packet with
Incorrect Frame Number, or with CRC/Bit Stuff error.
RC 0 Incorrect EndPoint Access:
This bit is set to a '1' when USB Controller received an IN or OUT Token with
Incorrect EndPoint Number.
RC 0 USB Resume:
This bit is set to a '1' when USB Controller has received a Resume Signaling
from the Host PC.
RC 0 USB Reset:
This bit is set to a '1' when USB Controller has received a Reset Signaling
from the Host PC.
RC 0 USB Suspend:
This bit is set to a '1' when USB Controller detects that USB enters Suspend
state.
R 0 Reserved for future use
RC 0 Over Size on EndPoint2:
This bit is set to a '1' when the received data size is over Max Packet Size on
EP2.
RC 0 Extra Data on EndPoint2:
This bit is set to a '1' when an extra data packet is detected on Isochronous
EndPoint (EP2). In the case that EP2EN bit in U_EP2CR is set to a '0', this
bit will not be set even if the USB Controller detects an extra data on EP2.
RC 0 Isochronous Data Corrupted on EndPoint2:
Bit that indicates that Isochronous data is corrupted on EP2. In the case that
EP2EN bit in U_EP2CR is set to a '0', this bit will not be set even if the USB
Controller detects data corruption on EP2.
RC 0 No Token on EndPoint1:
This bit is set to a '1' when IN Token packet does not come on EP1 between
two SOFs. In the case that EP1EN bit in U_EP1CR is set to a '0', this bit will
not be set even if the USB Controller detects no token packet on EP1.
RC 0 Extra Token on EndPoint1:
This bit is set to a '1' when two IN Token packets are received on EP1
between two SOFs. In the case that EP1EN bit in U_EP1CR is set to a '0',
this bit will not be set even if the USB Controller detects an extra token
packet on EP1.
RC 0 No Data on EndPoint1:
This bit is set to a '1' when IN Token packet comes but any data is not ready
on EP1. In the case that EP1EN bit in U_EP1CR is set to a '0', this bit will not
be set even if the USB Controller detects no data condition on EP1.
RC 0 Extra SOF:
This bit is set to a '1' when extra SOF packet is detected.
RC 0 SOF Loss:
This bit is set to a '1' when USB Controller doesn't receive any SOF packet.
Preliminary User's Manual S15543EJ1V0UM
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