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AT43USB325 데이터시트(PDF) 86 Page - ATMEL Corporation

부품명 AT43USB325
상세설명  Multimedia USB Keyboard Controller with Embedded Hub
PDF  109 Pages
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제조업체  ATMEL [ATMEL Corporation]
홈페이지  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT43USB325 데이터시트(HTML) 86 Page - ATMEL Corporation

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86
3355C–USB–4/05
AT43USB325
8.4.4
Hub Port Status Register
The bits in this register are used by the microcontroller firmware when reporting a port's status
through the Port Status Field, wPortStatus. Bits 3 (POCI) and 5 (PPSTAT) are used by the USB
hardware and are the only two bits that the firmware should set or clear. All other bits should not
be modified by the firmware.
8.4.4.1
Hub Port Status Register – HPSTAT1:5
• Bit 7 – Reserved
This bit is reserved in the AT43USB325 and will read as zero.
• Bit 6 – LSP: Low-speed Device Attached
0 = Full-speed device attached to this port
1 = Slow-speed device attached to this port
Set to 0 for Port 1 (full-speed only). Set and cleared by the hardware upon detection of device at
EOF2.
• Bit 5 – PPSTAT: Port Power Status
0 = Port is powered OFF
1 = Port is powered ON
Set to 1 for Port 1. Set and cleared based on present status of port power.
• Bit 4 – PRSTAT: Port Reset Status
0 = Reset signaling not asserted
1 = Reset signaling asserted
Set and cleared by the hardware as a result of initiating a port reset by Port Control Register.
• Bit 3 – POCI: Port Overcurrent Indicator
0 = Power normal
1 = Overcurrent exist on port
Set to 0 for Port 1. Set and cleared by firmware upon detection of an overcurrent or removal of
an overcurrent.
Bit
7
6
5
4
3
2
1
0
Port1 $1FB8
–
LSP
PPSTAT
PRSTAT
POCI
PSSTAT
PESTAT
PCSTAT
HPSTAT1
Port2 $1FB9
–
LSP
PPSTAT
PRSTAT
POCI
PSSTAT
PESTAT
PCSTAT
HPSTAT2
Port3 $1FBA
–
LSP
PPSTAT
PRSTAT
POCI
PSSTAT
PESTAT
PCSTAT
HPSTAT3
Port4 $1FBB
–
LSP
PPSTAT
PRSTAT
POCI
PSSTAT
PESTAT
PCSTAT
HPSTAT4
Port5 $1FBC
–
LSP
PPSTAT
PRSTAT
POCI
PSSTAT
PESTAT
PCSTAT
HPSTAT5
Read/Write
R
R
R/W
R
R/W
R
R
R
Initial Value
0
0
0
0
0
0
0
0



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