Integration
14.2.2 Ethernet Switch Clock and Reset Management
The ethernet switch controller operates in its own clock domain and its initiator and target interfaces are
connected to the L3/L4 through asynchronous bridges. The OCP interfaces are driven by the MAIN clock
input. Additional reference clock inputs are provided for operating the various ethernet ports at different
rates.
Table 14-3. Ethernet Switch Clock Signals
Clock Signal
Max Freq
Reference / Source
Comments
rft_clk
125 MHz
Tied low
not supported
Gigabit GMII Tx Reference
clock
main_clk
125 MHz
CORE_CLKOUTM5 / 2
pd_per_cpsw_125mhz_gclk
Logic/Interface clock
from PRCM
mhz250_clk
250 MHz
CORE_CLKOUTM5
pd_per_cpsw_250mhz_gclk
Gigabit RGMII Reference clock
from PRCM
mhz50_clk
50 MHz
CORE_CLKOUTM5 / 5
pd_per_cpsw_50mhz_gclk
RMII and 100mbps RGMII
from PRCM
Reference clock
mhz5_clk
5 MHz
CORE_CLKOUTM5 / 50
pd_per_cpsw_5mhz_gclk
10 mbpsRGMII Reference
from PRCM
clock
cpts_rft_clk
250 MHz
CORE_CLKOUTM4
pd_per_cpsw_cpts_rft_clk
IEEE 1588v2 clock
CORE_CLKOUTM5
from PRCM
gmii1_mr_clk
25 MHz
External Pin
gmii1_rxclk_in
GMII Port 1 Receive clock
from GMII1_RCLK pad
gmii2_mr_clk
25 MHz
External Pin
gmii2_rxclk_in
GMII Port 2 Receive clock
from GMII2_RCLK pad
gmii1_mt_clk
25 MHz
External Pin
gmii1_txclk_in
GMII Port 1 Transmit clock
from GMII1_TCLK pad
gmii2_mt_clk
25 MHz
External Pin
gmii2_txclk_in
GMII Port 2 Transmit clock
from GMII2_TCLK pad
rgmii1_rxc_clk
250 MHz
External Pin
rgmii1_rclk_in
RGMII Port 1 Receive clock
from RGMII1_RCLK pad
rgmii2_rxc_clk
250 MHz
External Pin
rgmii2_rclk_in
RGMII Port 2 Receive clock
from RGMII2_RCLK pad
rmii1_mhz_50_clk
50 MHz
External Pin
rmii1_refclk_in
RMII Port 1 Reference clock
from RMII1_REFCLK pad
rmii2_mhz_50_clk
50 MHz
External Pin
rmii2_refclk_in
RMII Port 2 Reference clock
from RMII2_REFCLK pad
1168
Ethernet Subsystem
SPRUH73H – October 2011 – Revised April 2013
Copyright © 2011–2013, Texas Instruments Incorporated