參數(shù)資料
型號: ISP1161BD
廠商: NXP SEMICONDUCTORS
元件分類: 總線控制器
英文描述: Full-speed Universal Serial Bus single-chip host and device controller
中文描述: UNIVERSAL SERIAL BUS CONTROLLER, PQFP64
封裝: 10 X 10 MM, 1.40 MM HEIGHT, PLASTIC, MS-026, SOT-314-2, LQFP-64
文件頁數(shù): 21/127頁
文件大小: 2762K
代理商: ISP1161BD
Philips Semiconductors
ISP1161
Full-speed USB single-chip host and device controller
Product data
Rev. 01 — 3 July 2001
21 of 130
9397 750 08313
Philips Electronics N.V. 2001. All rights reserved.
Bits RESET, RESUME, EOT and SOF are cleared upon reading the Interrupt
Register. The endpoint bits (EP0OUT to EP14) are cleared by reading the associated
Endpoint Status Register.
Bit BUSTATUS follows the USB bus status exactly, allowing the firmware to get the
current bus status when reading the Interrupt Register.
SETUP and OUT token interrupts are generated after ISP1161’s DC has
acknowledged the associated data packet. In bulk transfer mode, the ISP1161’s DC
will issue interrupts for every ACK received for an OUT token or transmitted for an IN
token.
In isochronous mode, an interrupt is issued upon each packet transaction. The
firmware must take care of timing synchronization with the host. This can be done via
the Pseudo Start-Of-Frame (PSOF) interrupt, enabled via bit IEPSOF in the Interrupt
Enable Register. If a Start-Of-Frame is lost, PSOF interrupts are generated every
1 ms. This allows the firmware to keep data transfer synchronized with the host. After
3 missed SOF events the ISP1161’s DC will enter ‘suspend’ state.
An alternative way of handling isochronous data transfer is to enable both the SOF
and the PSOF interrupts and disable the interrupt for each isochronous endpoint.
Fig 22. DC interrupt logic.
MGT946
RESET
SUSPND
RESUME
SOF
EP14
...
EP0IN
.
.
.
.
EP0OUT
EOT
IERST
DC Interrupt register
DC Interrupt Enable register
IESUSP
IERESM
IESOF
IEP14
...
IEP0IN
IEP0OUT
IEEOT
DC Device Mode register
INTENA
INTLVL
DC Hardware Configuration
register
INTPOL
PULSE
GENERATOR
INT2
1
0
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