KSZ8895MQX Datasheet, PDF (53/108 Pages) Microchip Technology – Integrated 5-Port 10/100 Managed Ethernet Switch with MII/RMII Interface

KSZ8895MQX/RQX/FQX/MLX
TABLE 4-2: GLOBAL REGISTER DESCRIPTIONS (CONTINUED)
Address Name
Description
Mode
Default
Select the internal clock speed for SPI, MDI inter-
face:
5-4
CPU
interface
clock select
00 = 41.67 MHz (SPI up to 6.25 MHz, MDC up to
6 MHz)
01 = 83.33 MHz Default (SPI SCL up to 12.5 MHz,
MDC up to 12 MHz)
R/W
01
10 = 125 MHz (for high speed SPI about 25 MHz)
11 = Reserved
3
Reserved N/A Do not change
RO
0
This bit is to enable PHY5, when in 10BT mode, to
Enable
restore preamble before sending data on P5-MII
2
restore
interface.
R/W
1
preamble
1 = Enable PHY5 to restore preamble.
0 = Disable PHY5 to restore preamble.
1
Tail Tag
Enable
Tail Tag feature is applied for Port 5 only.
1 = Insert 1 Byte of data right before FCS
0 = Do not insert
R/W
0
Pass Flow 1 = Switch will not filter 802.1x “flow control”
0
Control
packets
R/W
0
Packet
0 = Switch will filter 802.1x “flow control” packets
Register 13 (0x0D): Global Control 11
7-0
Factory
Testing
N/A Do not change
RO
00000000
Register 14 (0x0E): Power Down Management Control 1
7
Reserved N/A Do not change
RO
0
6
Reserved N/A Do not change
RO
0
5
PLL Power
Down
PLL power down enable:
1 = Disable
0 = Enable
R/W
0
4-3
Power
Manage-
ment Mode
Power management mode:
00 = Normal mode (D0)
01 = Energy Detection mode (D2)
10 = Soft Power Down mode (D3)
11 = Power Saving mode (D1)
Note: For Soft Power Down mode to take effect,
have to write ‘10’ only without read value back.
00
Pin LED[4][0] strap
option.
PD(0): Select Energy
R/W
detection mode
PU(1): (default) Nor-
mal mode
Note: LED[4][0] has
internal pull-up.
2 - 0 Reserved N/A Do not change
RO
000
Register 15 (0x0F): Power Down Management Control 2
When the Energy Detect mode is on, this value is
used to control the minimum period that the no
7-0
Go_sleep_- energy event has to be detected consecutively
time[7:0]
before the device enters the low power state. The
R/W
unit is 20 ms. The default of go sleep time is 1.6
seconds (80 Dec x 20 ms).
01010000
Note 4-1 148,800 frames/sec × 50 ms/interval × 1% = 74 frames/interval (approx.) = 0x4A.
 2016 Microchip Technology Inc.
DS00002246A-page 53