ISP1508AET NXP Semiconductors, ISP1508AET Datasheet - Page 33

• Manufacturer Part Number: ISP1508AET
• Description: RF Transceiver USB 2.0 ULPI TRNSCVR
• Manufacturer: NXP Semiconductors

Specifications of ISP1508AET

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 935283548118 ISP1508AET-T

NXP Semiconductors
ISP1508A_ISP1508B_1
Product data sheet
10.2.2.4 RxEvent encoding
OTG devices:
provide a minimum of 8 mA on V
there is no need for an overcurrent detection circuit because the internal A_VBUS_VLD
comparator is sufficient. If the OTG A-device provides more than 100 mA on V
overcurrent detector must be used and
The OTG A-device also uses SESS_VLD to detect when an OTG A-device is initiating
V
When an OTG device is configured as an OTG B-device, SESS_VLD must be used to
detect when V
when V
pulsing SRP.
The RxEvent field (see
packets received on the USB bus. RxActive and RxError are defined in USB 2.0
Transceiver Macrocell Interface (UTMI) Specification Ver. 1.05 . HostDisconnect is defined
in UTMI+ Specification Rev. 1.0 . A short definition is also given in the following
subsections.
Table 21.
RxActive:
RxActive event to the link. An RxActive event can be communicated using two methods.
The first method is for the ISP1508 to simultaneously assert DIR and NXT. The second
method is for the ISP1508 to send an RXCMD to the link with the RxActive field in the
RxEvent bits set to logic 1. The link must be capable of detecting both methods. RxActive
frames the receive packet from the first byte to the last byte.
The link must assume that RxActive is set to logic 0 when indicated in an RXCMD or when
DIR is de-asserted, whichever occurs first.
The link uses RxActive to time high-speed packets and ensure that bus turnaround times
are met. For more information on the USB packet timing, see
RxError:
de-asserts NXT and sends an RXCMD with the RxError field set to logic 1. The received
packet is no longer valid and must be dropped by the link.
HostDisconnect:
HostDisconnect is valid only when the ISP1508 is configured as a host (both
DP_PULLDOWN and DM_PULLDOWN are set to logic 1), and indicates to the Host
Controller when a peripheral is connected (0b) or disconnected (1b). The Host Controller
must enable HostDisconnect by setting the HOST_DISCON_R and HOST_DISCON_F
bits in the USB Interrupt Enable Rising and USB Interrupt Enable Falling registers,
respectively. Changes in HostDisconnect will cause the PHY to send an RXCMD to the
link with the updated value.
Value
00
01
11
10
BUS
pulsing SRP.
BUS
When the ISP1508 has detected an error while receiving a USB packet, it
Encoded USB event signals
When the ISP1508 has detected a SYNC pattern on the USB bus, it signals an
has dropped to a LOW level, allowing the B-device to safely initiate V
BUS
When an OTG device is configured as an OTG A-device, it must be able to
is at a sufficient level for operation. SESS_END must be used to detect
HostDisconnect is encoded into the RxEvent field of the RXCMD.
RxActive
0
1
1
X
Rev. 01 — 14 August 2007
Table
21) of the RXCMD informs the link of information related
BUS
. If the OTG A-device provides less than 100 mA, then
Section “Standard USB Host Controllers”
RxError
0
0
1
X
ISP1508A; ISP1508B
Section
ULPI HS USB transceiver
HostDisconnect
0
0
0
1
10.5.1.
© NXP B.V. 2007. All rights reserved.
BUS
BUS
applies.
, an
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