ISP1507DBSUM STEricsson, ISP1507DBSUM Datasheet - Page 26

• Manufacturer Part Number: ISP1507DBSUM
• Manufacturer: STEricsson

Specifications of ISP1507DBSUM

• Lead Free Status / RoHS Status: Compliant

CD00222690
Product data sheet
9.5.2.4 RxEvent encoding
OTG devices:
that supplies less than 100 mA on V
pin. The internal A_VBUS_VLD comparator can be used. If the OTG A-device provides
more than 100 mA on V
USB host controllers” on page 25
detect when an OTG B-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 14.
RxActive:
RxActive event to the link. An RxActive event can be communicated using two methods.
The first method is for the ISP1507 to simultaneously assert DIR and NXT. The second
method is for the ISP1507 to send an RXCMD to the link with the RxActive field in
RxEvent bits set to logic 1. The link must be able to detect 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 deasserted, 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:
deasserts 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packet is no longer valid and must be dropped by the link.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 ISP1507 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 or disconnected. The host controller must
enable HostDisconnect by setting the HOST_DISCON_R and HOST_DISCON_F bits in
the USB_INTR_EN_R_E and USB_INTR_EN_F_E 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
When the ISP1507 has detected an error while receiving a USB packet, it
Encoded USB event signals
When the ISP1507 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
The ISP1507 provides partial OTG support. A low-power OTG A-device
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
Table
BUS
Rev. 04 — 20 May 2010
, an overcurrent detector must be used and
14) of the RXCMD informs the link of information related
applies. The OTG A-device also uses SESS_VLD to
BUS
can connect the V
ULPI HS USB host and peripheral transceiver
RxError
0
0
1
X
BUS
ISP1507C; ISP1507D
pulsing SRP.
BUS
Section
power to the ISP1507 V
HostDisconnect
0
0
0
1
© ST-ERICSSON 2010. All rights reserved.
9.8.1.
Section “Standard
BUS
26 of 73
BUS