参数资料
型号: PCM9211PTR
厂商: TEXAS INSTRUMENTS INC
元件分类: 网络接口
英文描述: DATACOM, TOKEN RING TRANSCEIVER, PQFP48
封装: GREEN, PLASTIC, LQFP-48
文件页数: 74/121页
文件大小: 1219K
代理商: PCM9211PTR
tM S S
LSB (D0)
MDI
MC
MS
tMDH
tMDS
t MS H
tMCH
tMCL
tMCY
1.4V
MDO
0.5*V
DD
tMD D
t MHH
t MDR
LSB (D0 )
MSB(D7)
MSB(R/W)
Hi - Z
tM DD
ADR0
SBAS495 – JUNE 2010
www.ti.com
Timing Requirements
Figure 39 shows a detailed timing diagram for the four-wire serial control interface. These timing parameters are
critical for proper control port operation.
SYMBOL
DESCRIPTION
MIN
MAX
UNITS
tMCY
MC Pulse cycle time
100
ns
tMCL
MC Low level time
40
ns
tMCH
MC High level time
40
ns
tMHH
MS High level time
tMCY
ns
tMSS
MS Falling edge to MC rising edge
30
ns
tMSH
MS Rising edge from MC rising edge for LSB
15
ns
tMDH
MDI Hold time
15
ns
tMDS
MDI Set-up time
15
ns
tMDD
MDO Enable or delay time from MC falling edge
0
30
ns
tMDR
MDO Disable time from MS rising edge
0
30
ns
Figure 39. Control Interface Timing Requirements
Two-Wire (I
2C) Serial Control
The PCM9211 also supports the I2C serial bus and data transmission protocol. It can be configured for fast mode
as a slave device. This protocol is explained fully in the I2C specification 2.1.
Slave Address
MSB
LSB
1
0
ADR1
ADR0
R/W
The PCM9211 has seven bits for its own slave address. The first five bits (MSB) of the slave address are
factory-preset to '10000'. The next two bits of the address byte are selectable bits that can be set by MDO/ADR0
and MS/ADR1. A maximum of four PCM9211s can be connected on the same bus at one time. Each PCM9211
responds when it receives its own slave address.
56
Copyright 2010, Texas Instruments Incorporated
Product Folder Link(s): PCM9211
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