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ISP1505CBS Datasheet(PDF) 17 Page - NXP Semiconductors |
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ISP1505CBS Datasheet(HTML) 17 Page - NXP Semiconductors |
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17 / 76 page  ISP1505A_ISP1505C_3 © NXP B.V. 2008. All rights reserved. Product data sheet Rev. 03 — 26 August 2008 16 of 75 NXP Semiconductors ISP1505A; ISP1505C ULPI HS USB host and peripheral transceiver 8.2 USB and OTG state transitions A Hi-Speed USB peripheral, host or OTG device handles more than one electrical state as defined in Universal Serial Bus Specification Rev. 2.0 and On-The-Go Supplement to the USB 2.0 Specification Rev. 1.3. The ISP1505 accommodates the various states through register bit settings of XCVRSELECT[1:0], TERMSELECT, OPMODE[1:0], DP_PULLDOWN and DM_PULLDOWN. Table 7 summarizes operating states. The values of register settings in Table 7 will force resistor settings as also given in Table 7. Resistor setting signals are defined as follows: • RPU_DP_EN enables the 1.5 k Ω pull-up resistor on DP • RPD_DP_EN enables the 15 k Ω pull-down resistor on DP • RPD_DM_EN enables the 15 k Ω pull-down resistor on DM • HSTERM_EN enables the 45 Ω termination resistors on DP and DM It is up to the link to set the desired register settings. Table 6. Signal mapping for 3-pin serial mode Signal Maps to Direction Description TX_ENABLE DATA0 I active HIGH transmit enable DAT DATA1 I/O transmit differential data on DP and DM when TX_ENABLE is HIGH receive differential data from DP and DM when TX_ENABLE is LOW SE0 DATA2 I/O transmit single-ended zero on DP and DM when TX_ENABLE is HIGH receive single-ended zero from DP and DM when TX_ENABLE is LOW INT DATA3 O active HIGH interrupt indication; will be asserted whenever any unmasked interrupt occurs Reserved DATA[7:4] O reserved; the ISP1505 will drive these pins to LOW Table 7. Operating states and their corresponding resistor settings Signaling mode Register settings Internal resistor settings XCVR SELECT [1:0] TERM SELECT OPMODE [1:0] DP_PULL DOWN DM_PULL DOWN RPU_ DP_EN RPD_ DP_EN RPD_ DM_EN HSTERM _EN General settings 3-state drivers XXb Xb 01b Xb Xb 0b 0b 0b 0b Power-up or VBUS <VB_SESS_END 01b 0b 00b 1b 1b 0b 1b 1b 0b Host settings Host chirp 00b 0b 10b 1b 1b 0b 1b 1b 1b Host high-speed 00b 0b 00b 1b 1b 0b 1b 1b 1b Host full-speed X1b 1b 00b 1b 1b 0b 1b 1b 0b Host high-speed or full-speed suspend 01b 1b 00b 1b 1b 0b 1b 1b 0b Host high-speed or full-speed resume 01b 1b 10b 1b 1b 0b 1b 1b 0b Host low-speed 10b 1b 00b 1b 1b 0b 1b 1b 0b |
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