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參數(shù)資料
| 型號： | KSZ8995FQ |
| 廠商： | Micrel Inc |
| 文件頁數(shù)： | 38/89頁 |
| 文件大小： | 0K |
| 描述： | IC SWITCH 10/100 5PORT 128-PQFP |
| 標(biāo)準(zhǔn)包裝： | 66 |
| 系列： | * |
| 產(chǎn)品目錄頁面： | 1081 (CN2011-ZH PDF) |
| 配用： | 576-3872-ND - BOARD EVALUATION FOR KSZ8995FQ |
| 其它名稱： | 576-3077 |
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Micrel, Inc.
KS8995MA/FQ
October 2011
43
M9999-102611-3.0
I
2C Master Serial Bus Configuration
If a 2-wire EEPROM exists, the KS8995MA/FQ can perform more advanced features like broadcast storm protection and
rate control. The EEPROM should have the entire valid configuration data from Register 0 to Register 109 defined in the
“Memory Map,” except the status registers. After reset, the KS8995MA/FQ will start to read all 110 registers sequentially
from the EEPROM. The configuration access time (tprgm) is less than 15ms as shown in Figure 8.
....
RST_N
SCL
SDA
tprgm <15 ms
Figure 8. KS8995MA/FQ EEPROM Configuration Timing Diagram
To configure the KS8995MA/FQ with a pre-configured EEPROM use the following steps:
1. At the board level, connect Pin 110 on the KS8995MA/FQ to the SCL pin on the EEPROM. Connect pin 111 on the
KS8995MA/FQ to the SDA pin on the EEPROM.
2. Set the input signals PS[1:0] (Pins 113 and 114, respectively) to “00.” This puts the KS8995MA/FQ serial bus
configuration into I
2C master mode.
3. Be sure the board-level reset signal is connected to the KS8995MA/FQ reset signal on Pin 115 (RST_N).
4. Program the contents of the EEPROM before placing it on the board with the desired configuration data. Note that the
first byte in the EEPROM must be “95” for the loading to occur properly. If this value is not correct, all other data will
be ignored.
5. Place the EEPROM on the board and power up the board. Assert the active-low board level reset to RST_N on the
KS8995MA/FQ. After the reset is de-asserted, the KS8995MA/FQ will begin reading configuration data from the
EEPROM. The configuration access time (tprgm) is less than 15ms.
Note
: For proper operation, make sure that Pin 47 (PWRDN_N) is not asserted during the reset operation.
SPI Slave Serial Bus Configuration
The KS8995MA/FQ can also act as an SPI slave device. Through the SPI, the entire feature set can be enabled, including
“VLAN,” “IGMP snooping,” “MIB counters,” etc. The external master device can access any register from Register 0 to
Register 127 randomly. The system should configure all the desired settings before enabling the switch in the
KS8995MA/FQ. To enable the switch, write a "1" to Register 1 Bit 0.
Two standard SPI commands are supported (00000011 for “READ DATA,” and 00000010 for “WRITE DATA”). To speed
configuration time, the KS8995MA/FQ also supports multiple reads or writes. After a byte is written to or read from the
KS8995MA/FQ, the internal address counter automatically increments if the SPI Slave Select Signal (SPIS_N) continues
to be driven low. If SPIS_N is kept low after the first byte is read, the next byte at the next address will be shifted out on
SPIQ. If SPIS_N is kept low after the first byte is written, bits on the Master Out Slave Input (SPID) line will be written to
the next address. Asserting SPIS_N high terminates a read or write operation. This means that the SPIS_N signal must
be asserted high and then low again before issuing another command and address. The address counter wraps back to
zero once it reaches the highest address. Therefore the entire register set can be written to or read from by issuing a
single command and address.
The KS8995MA/FQ is able to support a 5MHz SPI bus. A high-performance SPI master is recommended to prevent
internal counter overflow.
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| KSZ8995FQ-EVAL | 功能描述:以太網(wǎng)開發(fā)工具 Integrated 5-Port Switch with Fiber on Port 3 & 4 Evaluation Board RoHS:否 制造商:Micrel 產(chǎn)品:Evaluation Boards 類型:Ethernet Transceivers 工具用于評估:KSZ8873RLL 接口類型:RMII 工作電源電壓: |
| KSZ8995FQI | 功能描述:以太網(wǎng) IC 5 Port 10/100 Switch with PHY and Frame Buffers (Lead Free) RoHS:否 制造商:Micrel 產(chǎn)品:Ethernet Switches 收發(fā)器數(shù)量:2 數(shù)據(jù)速率:10 Mb/s, 100 Mb/s 電源電壓-最大:1.25 V, 3.45 V 電源電壓-最小:1.15 V, 3.15 V 最大工作溫度:+ 85 C 封裝 / 箱體:QFN-64 封裝:Tray |
| KSZ8995M | 功能描述:以太網(wǎng) IC 5 Port 10/100 Switch with PHY and Frame Buffers (Lead Free) RoHS:否 制造商:Micrel 產(chǎn)品:Ethernet Switches 收發(fā)器數(shù)量:2 數(shù)據(jù)速率:10 Mb/s, 100 Mb/s 電源電壓-最大:1.25 V, 3.45 V 電源電壓-最小:1.15 V, 3.15 V 最大工作溫度:+ 85 C 封裝 / 箱體:QFN-64 封裝:Tray |
| KSZ8995MA | 功能描述:以太網(wǎng) IC 5 Port 10/100 Switch with PHY and Frame Buffers (Lead Free) RoHS:否 制造商:Micrel 產(chǎn)品:Ethernet Switches 收發(fā)器數(shù)量:2 數(shù)據(jù)速率:10 Mb/s, 100 Mb/s 電源電壓-最大:1.25 V, 3.45 V 電源電壓-最小:1.15 V, 3.15 V 最大工作溫度:+ 85 C 封裝 / 箱體:QFN-64 封裝:Tray |
| KSZ8995MA4 | 功能描述:IC SWITCH 5-PORT 10/100 128PQFP RoHS:是 類別:集成電路 (IC) >> 專用 IC 系列:* 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:1 系列:- 類型:調(diào)幀器 應(yīng)用:數(shù)據(jù)傳輸 安裝類型:表面貼裝 封裝/外殼:400-BBGA 供應(yīng)商設(shè)備封裝:400-PBGA（27x27） 包裝:散裝 |
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