KSZ8842-16 Datasheet, PDF (17/126 Pages) Micrel Semiconductor – 2-Port Ethernet Switch with Non-PCI Interface

Micrel Confidential
KSZ8842-16/32 MQL/MVL
Pin Description for KSZ8842-32 Switches (32-Bit)
Pin
Number
1
Pin Name Type
TEST_EN I
2
SCAN_EN I
3
P1LED2
Opu
4
P1LED1
Opu
5
P1LED0
Opu
Pin Function
Test Enable
For normal operation, pull-down this pin to ground.
Scan Test Scan Mux Enable
For normal operation, pull-down this pin to ground.
Port 1 and Port 2 LED indicators¹ defined as follows:
Switch Global Control Register 5:
SGCR5 bit [15,9]
P1LED3² /P2LED3
[0,0] Default
[0,1]
—
—
P1LED2/P2LED2
Link/Act
100Link/Act
P1LED1/P2LED1
Full duplex/Col 10Link/Act
P1LED0/P2LED0
Speed
Full duplex
6
P2LED2
Opu
7
P2LED1
Opu
8
P2LED0
Opu
9
DGND
Gnd
10
VDDIO
P
11
RDYRTNN Ipd
November 2005
Reg. SGCR5 bit [15,9]
[1,0]
[1,1]
P1LED3² /P2LED3
Act
—
P1LED2/P2LED2
Link
—
P1LED1/P2LED1
Full duplex/Col —
P1LED0/P2LED0
Speed
—
Notes:
1. Link = On; Activity = Blink; Link/Act = On/Blink; Full Dup/Col = On/Blink;
Full Duplex = On (Full duplex); Off (Half duplex)
Speed = On (100BASE-T); Off (10BASE-T)
2. P1LED3 is pin 27. P2LED3 is pin 22.
Port 1 and Port 2 LED indicators³ for Repeater mode defined as follows:
Switch Global Control Register 5: SGCR5 bit
[15,9]
[0,0] Default
[0,1] [1,0] [1,1]
P1LED3; P2LED3 RPT_COL; RPT_ACT
—
P1LED2; P2LED2 RPT_Link3/RX; RPT_ERR3 —
P1LED1; P2LED1 RPT_Link2/RX; RPT_ERR2 —
P1LED0; P2LED0 RPT_Link1/RX; RPT_ERR1 —
Note 3: RPT_COL = Blink; RPT_Link3/RX (Host port) = On/Blink;
RPT_Link2/RX (Port 2) = On/Blink; RPT_Link1/RX (Port 1) = On/Blink;
RPT_ACT = on if any activity, RPT_ERR3/2/1 = RX error on port 3, 2, or 1.
Digital ground
3.3V digital V_DDIO input power supply for IO with well decoupling capacitors.
Ready Return Not
For VLBus-like mode: Asserted by the host to complete synchronous read cycles. If
the host doesn’t connect to this pin, assert this pin.
For burst mode (32-bit interface only): Host drives this pin low to signal waiting
states.
17
Rev. 1.4