Samsung S5PC100 User Manual page 881

USB2.0 HS OTG
8.2.14 Device Mode Receive Status Debug Read/Status Read and Pop Registers (GRXSTSR/GRXSTSP, R,
Address = 0xED20_001C, 0xED20_0020)
GRXSTSR/ Bit
GRXSTSP
Reserved [31:25]
FN [24:21]
PktSts [20:17]
DPID [16:15]
BCnt [14:4]
EPNum [3:0]
8.10 -38
-
Frame Number
This is the least significant 4 bits of the (micro) frame number in
which the packet is received on the USB. This field is
supported if isochronous OUT endpoints are supported.
Packet Status
Indicates the status of the received packet.
• 4'b0001: Global OUT NAK (triggers an interrupt)
• 4'b0010: OUT data packet received
• 4'b0011: OUT transfer completed (triggers an interrupt)
• 4'b0100: SETUP transaction completed (triggers an interrupt)
• 4'b0110: SETUP data packet received
• others: Reserved
Data PID
Indicates the Data PID of the received OUT data packet.
• 2'b00 : DATA0
• 2'b10 : DATA1
• 2'b01 : DATA2
• 2'b11 : MDATA
Byte Count
Indicates the byte count of the received data packet.
Endpoint number
Indicates the endpoint number to which the current received
packet belongs.
Description
S5PC100 USER'S MANUAL (REV1.0)
R/W Reset Value
R
R
R
R
R
7'h3F
4'hF
4'b1111
2'b11
11'h3FF
4'hF