參數(shù)資料
型號： ZL50408GDG2
廠商： CONEXANT SYSTEMS
元件分類： 網(wǎng)絡(luò)接口
英文描述： DATACOM, LAN SWITCHING CIRCUIT, PBGA208
封裝： 17 X 17 MM, 1.40 MM HEIGHT, LEAD FREE, MO-192, LBGA-208
文件頁數(shù)： 61/144頁
文件大?。?/td> 1779K
代理商： ZL50408GDG2
ZL50408
Data Sheet
23
Zarlink Semiconductor Inc.
1.5
Bootstrap Options
TSTOUT[15:0], M[7:0]_TXEN, M9_TXEN and M9_TXER pins serve as bootstrap pins during device power-up or
reset. Please refer to “Typical Reset & Bootstrap Timing Diagram” on page 129 for more information on when the
bootstrap pins are sampled. The bootstrap pins require external pull-up/down resistors for proper operation.
Recommend 10 K for pull-ups and 1 K for pull-downs.
The table below summarizes the bootstrap options.
1.5.1
Recommended Default Bootstrap Settings
The following are the recommended default settings for the bootstrap options:
Unmanaged/Lightly Managed
Reserved/Manufacturing bootstraps
- TSTOUT[15:13,8] must be pulled-up
- TSTOUT[10] must be pulled-down
CPU Interface:
- Strobe debounce bootstrap, TSTOUT[0], should be normally pulled-up, unless you wish to disable the
debounce logic
- CPU Interface bootstrap, TSTOUT[3:1], should be pulled-up to indicate unmanaged SSI CPU
interface. To enable SSI-only lightly managed mode, pulled-down TSTOUT[3]. To enable SSI+MII
lightly managed mode, pulled-down TSTOUT[3,1]
Feature
Description
CPU Interface
The ZL50408 allows the selection of 5 different management interfaces:
8/16-bit parallel, serial with MII, serial only and unmanaged serial with I2C
EEPROM.
TSTOUT[3:1] is used to select the interface options mentioned above. If the
serial interface is selected, addition bootstrap options are required:
TSTOUT[0] enables or disables the DEBOUNCE feature (refer to
TSTOUT[6:4] selects the device ID
Also, in unmanaged mode, an optional I2C EEPROM can be used to configure
the device at power-up or reset. TSTOUT[7] selects the EEPROM option.
Ethernet Interface
The ZL50408 supports module hotswap on all it's ports. This is enabled via
TSTOUT[9]. When enabled, bootstrap pins M[7:0]_TXEN (ports 0-7) and
M9-TXEN & M9_TXER (port 9) are used to specify the module type to support
multiple ethernet interfaces during module hotswap.
Another feature is the MAC power savings mode. When enabled via
TSTOUT[11], each port's MAC will detect inactivity on the port and go into a
power savings state. When activity is detected once again on the port, the MAC
will come out of this state.
Misc. Features
One other feature selected via bootstrap is Timeout Reset Enable
(TSTOUT[12]). This enables a monitoring block with the device which will
detect if any hardware state machine is in a non-idle state for more than 5
seconds.
Refer to section 2.7 for more details on this feature.
Table 4 - Bootstrap Features
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參數(shù)描述
ZL50409 制造商:ZARLINK 制造商全稱:Zarlink Semiconductor Inc 功能描述:Managed 9-Port 10/100M Ethernet Switch
ZL50409GDC 制造商:ZARLINK 制造商全稱:Zarlink Semiconductor Inc 功能描述:Managed 9-Port 10/100M Ethernet Switch
ZL50409GDC1 制造商:Microsemi Corporation 功能描述:
ZL50410 制造商:ZARLINK 制造商全稱:Zarlink Semiconductor Inc 功能描述:Managed 8-Port 10/100M + 1-Port 10/100/1000M Ethernet Switch
ZL50410GDC208 制造商:ZARLINK 制造商全稱:Zarlink Semiconductor Inc 功能描述:Managed 8-Port 10/100M + 1-Port 10/100/1000M Ethernet Switch
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