參數(shù)資料
型號(hào)： GL850A
廠商： Genesys Logic, Inc.
英文描述： USB 2.0 Low-Power HUB Controller
中文描述： 個(gè)USB 2.0低功耗集線器控制器
文件頁數(shù)： 16/29頁
文件大小： 403K
代理商： GL850A
GL850A USB 2.0 Low-Power HUB Controller
2000-2007 Genesys Logic Inc. - All rights reserved.
Page 16
CHAPTER 5 FUNCTION DESCRIPTION
5.1 General
5.1.1 USPORT Transceiver
USPORT (upstream port) transceiver is the analog circuit that supports both full-speed and high-speed
electrical characteristics defined in chapter 7 of
USB specification Revision 2.0
. USPORT transceiver will
operate in full-speed electrical signaling when GL850A is plugged into a 1.1 host/hub. USPORT transceiver
will operate in high-speed electrical signaling when GL850A is plugged into a 2.0 host/hub.
5.1.2 PLL (Phase Lock Loop)
GL850A contains a 40x PLL. PLL generates the clock sources for the whole chip. The generated clocks are
proven quite accurate that help in generating high speed signal without jitter.
5.1.3 FRTIMER
This module implements hub (micro)frame timer. The (micro)frame timer is derived from the hub’s local
clock and is synchronized to the host (micro)frame period by the host generated Start of (micro)frame
(SOF). FRTIMER keeps tracking the host’s SOF such that GL850A is always safely synchronized to the
host. The functionality of FRTIMER is described in section 11.2 of
USB Specification Revision 2.0
.
5.1.4
μ
C
μ
C is the micro-processor unit of GL850A. It is an 8-bit RISC processor with 2K ROM and 64 bytes RAM.
It operates at 6MIPS of 12Mhz clock to decode the USB command issued from host and then prepares the
data to respond to the host. In addition,
μ
C can handle GPIO (general purpose I/O) settings and reading
content of EEPROM to support high flexibility for customers of different configurations of hub. These
configurations include self/bus power mode setting, individual/gang mode setting, downstream port number
setting, device removable/non-removable setting, and PID/VID setting.
5.1.5 UTMI (USB 2.0 Transceiver Macrocell Interface)
UTMI handles the low level USB protocol and signaling. It’s designed based on the Intel’s UTMI
specification 1.01. The major functions of UTMI logic are to handle the data and clock recovery, NRZI
encoding/decoding, Bit stuffing /de-stuffing, supporting USB 2.0 test modes, and serial/parallel conversion.
5.1.6 USPORT logic
USPORT implements the upstream port logic defined in section 11.6 of
USB specification Revision 2.0
. It
mainly manipulates traffics in the upstream direction. The main functions include the state machines of
Receiver and Transmitter, interfaces between UTMI and SIE, and traffic control to/from the REPEATER
and TT.
5.1.7 SIE (Serial Interface Engine)
SIE handles the USB protocol defined in chapter 8 of
USB specification Revision 2.0
. It co-works with
c
5.1.9 REPEATER
Repeater logic implements the control logic defined in section 11.4 and section 11.7 of
USB specification
Revision 2.0
. REPEATER controls the traffic flow when upstream port and downstream port are signaling
in the same speed. In addition, REPEATER will generate internal resume signal whenever a wakeup event
is issued under the situation that hub is globally suspended.
to play the role of the hub kernel. The main functions of SIE include the state machine of USB protocol
flow, CRC check, PID error check, and timeout check. Unlike USB 1.1, bit stuffing/de-stuffing is
implemented in UTMI, not in SIE.
5.1.8 Control/Status register
Control/Status register is the interface register between hardware and firmware. This register contains the
information necessary to control endpoint0 and endpoint1 pipelines. Through the firmware based
architecture, GL850A possesses higher flexibility to control the USB protocol easily and correctly.
相關(guān)PDF資料
PDF描述
GL850A-MNGXX USB 2.0 Low-Power HUB Controller
GL850A-MNNXX USB 2.0 Low-Power HUB Controller
GL850A-MSGXX USB 2.0 Low-Power HUB Controller
GL850A-MSNXX USB 2.0 Low-Power HUB Controller
GL850G USB 2.0 HUB Controller
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
GL850A-MNGXX 制造商:GENESYS 制造商全稱:GENESYS 功能描述:USB 2.0 Low-Power HUB Controller
GL850A-MNNXX 制造商:GENESYS 制造商全稱:GENESYS 功能描述:USB 2.0 Low-Power HUB Controller
GL850A-MSGXX 制造商:GENESYS 制造商全稱:GENESYS 功能描述:USB 2.0 Low-Power HUB Controller
GL850A-MSNXX 制造商:GENESYS 制造商全稱:GENESYS 功能描述:USB 2.0 Low-Power HUB Controller
GL850G 制造商:GENESYS 制造商全稱:GENESYS 功能描述:USB 2.0 HUB Controller
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