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Universal Serial Bus Interface – On-The-Go Module
21-20
Freescale Semiconductor
Table 21-18. USBSTS Field Descriptions
Field
Description
31–17
Reserved, must be cleared.
16
NAKI
NAK interrupt. Set by hardware for a particular endpoint when the TX/RX endpoint’s NAK bit and the
corresponding TX/RX endpoint’s NAK enable bit are set. The hardware automatically clears this bit when all
the enabled TX/RX endpoint NAK bits are cleared.
15
AS
Asynchronous schedule status. Reports the current real status of asynchronous schedule. Controller is not
immediately required to disable or enable the asynchronous schedule when software transitions the
USBCMD[ASE] bit. When this bit and the USBCMD[ASE] bit have the same value, the asynchronous schedule
is enabled (1) or disabled (0). Used only in host mode.
0 Disabled.
1 Enabled.
14
PS
Periodic schedule status. Reports current real status of periodic schedule. Controller is not immediately
required to disable or enable the periodic schedule when software transitions the USBCMD[PSE] bit. When this
bit and the USBCMD[PSE] bit have the same value, the periodic schedule is enabled or disabled. Used only in
host mode.
0 Disabled.
1 Enabled.
13
RCL
Reclamation. DetectS an empty asynchronous schedule. Used only by the host mode.
0 Non-empty asynchronous schedule.
1 Empty asynchronous schedule.
12
HCH
Host controller halted. This bit is cleared when the USBCMD[RS] bit is set. The controller sets this bit after it
stops executing because of the USBCMD[RS] bit being cleared, by software or the host controller hardware (for
example, internal error). Used only in host mode.
0 Running.
1 Halted.
11
Reserved, must be cleared.
10
ULPII
ULPI interrupt. Set by event completion. Present only in the OTG module.
9
Reserved, must be cleared.
8
SLI
Device-controller suspend. Non-EHCI bit present on the USB OTG module only. When a device controller
enters a suspend state from an active state, this bit is set. The device controller clears the bit upon exiting from
a suspend state. Used only by the device controller.
0 Active.
1 Suspended.
7
SRI
SOF received. This is a non-EHCI status bit. Software writes a 1 to this bit to clear it.
Host mode (USB host and USB OTG):
In host mode, this bit is set every 125
μ
s, provided PHY clock is present and running (for example, the port
is NOT suspended) and can be used by the host-controller driver as a time base.
Device mode (USB OTG-only):
When controller detects a start of (micro) frame, bit is set. When a SOF is extremely late, controller
automatically sets this bit to indicate an SOF was expected. Therefore, this bit is set roughly every 1 ms in
device FS mode and every 125
μ
sec in HS mode, and it is synchronized to the actual SOF received.
Because the controller is initialized to FS before connect, this bit is set at an interval of 1 ms during the
prelude to the connect and chirp.
MCF5329 Reference Manual, Rev 3
Summary of Contents for MCF5329
Page 106: ...ColdFire Core 3 32 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 148: ...Cache 5 22 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 154: ...Static RAM SRAM 6 6 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 184: ...Power Management 8 18 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 204: ...Reset Controller Module 10 8 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 220: ...System Control Module SCM 11 16 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 228: ...Crossbar Switch XBS 12 8 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 268: ...General Purpose I O Module 13 40 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 392: ...SDRAM Controller SDRAMC 18 30 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 436: ...Fast Ethernet Controller FEC 19 44 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 594: ...FlexCAN 23 30 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 678: ...Pulse Width Modulation PWM Module 26 22 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 684: ...Watchdog Timer Module 27 6 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 704: ...DMA Timers DTIM0 DTIM3 29 12 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 754: ...UART Modules 31 34 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 770: ...I2 C Interface 32 16 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 866: ...Debug Module 36 50 Freescale Semiconductor MCF5329 Reference Manual Rev 3...