#
#            Ethernet Phys Chip   U22   Signal Nets
#          ------------------------------------------
#
#
#                                            Original Rev.  11-Sept-2015
#                                            Current Rev.   31-May-2015
#
#
#   This file holds all of the signal nets for the  U22  Phys Chip.
#   
#   These are the nets for the   U22   Micrel  KSZ9031RNX
#   Phys Chip which carries Ethernet from  This Hub's FPGA
#   to  Switch B  on  This Hub.
#
#
#   This FPGA --> U22 Phys --> Cap Coupling --> Switch B on This Hub
#



#
#   ***  U22 Phys Chip  Nets to its  Capacitor Coupling to Switch B  ***
#
#   These nets are held in the netsfile:  switch_chip_to_cap_coupled_nets
#




#
#   ***  U22 Phys Chip  Nets to its  Front Panel LEDs  ***
#
#   These nets are held in the netsfile:  led_connection_nets
#




#
#   Connect the 12.1k Ohm  ISET  Resistor  R1965
#

NET  'Phys_U22_ISET'    U22-48    R1965-1
NET  'GROUND'                     R1965-2




#
#   Jumper  aka Strapping  Resistors for the 4  MODE  lines
#
#    - pin 32 MODE0 and pin 31 MODE1  have pull-up and pull-down
#    - pin 28 MODE2 and pin 27 MODE3  have pull-up only
#
#    - These are all high-speed RGMII receiver data lines
#      so layout matters,  no stubs
#

NET  'Phys_U22_RXD3__MODE3'   U22-27   R1957-1
NET  'Phys_U22_DVDDH'                  R1957-2

NET  'Phys_U22_RXD2__MODE2'   U22-28   R1958-1
NET  'Phys_U22_DVDDH'                  R1958-2


NET  'Phys_U22_RXD1__MODE1'   U22-31   R1959-1   R1960-1
NET  'Phys_U22_DVDDH'                  R1959-2
NET  'GROUND'                                    R1960-2


NET  'Phys_U22_RXD0__MODE0'   U22-32   R1961-1   R1962-1
NET  'Phys_U22_DVDDH'                  R1961-2
NET  'GROUND'                                    R1962-2




#
#   Jumper  aka Strapping  Resistors for the  LED MODE
#   This is pull-up only
#

NET  'Phys_U22_CLK125__LED_MODE'   U22-41   R1964-1
NET  'Phys_U22_DVDDH'                       R1964-2




#
#   Jumper  aka Strapping  Resistors for the  CLK125 ENABLE
#   This is pull-up only
#

NET  'Phys_U22_RX_DV__CLK125_EN'   U22-33   R1963-1
NET  'Phys_U22_DVDDH'                       R1963-2




#
#   Jumper  aka Strapping  Resistors for the 3  PHYAD  lines
#
#    - pin 17 PHYAD0    pin 15 PHYAD1    pin 35 PHYAD2
#      all have pull-up and pull-down resistors
#
#    - Pin 35  RX_CLK__PHYAD2  is a high-speed RGMII receiver
#      clock line so layout matters,  no stubs
#
#    - The  PHYAD  is the address for management operations
#      over the MDC MDIO bus lines.
#
#    - Note that the Jumpers for PHYAD0 and PHYAD1  are located
#      up by the LED translator/driver U553 and the Pull-Up jumpers
#      for these lines uses a filtered 1V8 supply instead of the
#      U22 DVDDH bus.
#

NET  'Phys_U22_LED1__PHYAD0'     U22-17   R1951-1   R1952-1
NET  'RC_FLTR_1V8'                        R1951-2
NET  'GROUND'                                       R1952-2

NET  'Phys_U22_LED2__PHYAD1'     U22-15   R1953-1   R1954-1
NET  'RC_FLTR_1V8'                        R1953-2
NET  'GROUND'                                       R1954-2

NET  'Phys_U22_RX_CLK__PHYAD2'   U22-35   R1955-1   R1956-1
NET  'Phys_U22_DVDDH'                     R1955-2
NET  'GROUND'                                       R1956-2




#
#   No Connection Pin - the Hub Module does not use these pins
#

NET  'NO_CONN_Phys_U22_NC_PIN_13'    U22-13

NET  'NO_CONN_Phys_U22_LDO_PIN_43'   U22-43

NET  'NO_CONN_Phys_U22_X0_PIN_45'    U22-45

NET  'NO_CONN_Phys_U22_NC_PIN_47'    U22-47




#
#   Define the Phys U22  RGMII  Bus Lines:
#
#     Note that the pins for the following  RGMII Bus Lines
#     have already been defined in the  jumper strapping
#     section above:
#
#     RXD0__MODE0,  RXD1__MODE1,  RXD2__MODE2,  RXD3__MODE3,
#     RX_CLK__PHYAD2
#
#

NET  'Phys_U22_TXD0'      U22-19
NET  'Phys_U22_TXD1'      U22-20
NET  'Phys_U22_TXD2'      U22-21
NET  'Phys_U22_TXD3'      U22-22

NET  'Phys_U22_GTX_CLK'   U22-24

NET  'Phys_U22_TX_EN'     U22-25




#
#   Define the  25.000 MHz Clock Input  pin X1:
#
#     Note that pin  X0  was defined in the No Connect section
#

NET  'Phys_U22_X1'   U22-46




#
#   Define the Phys U22  Management Bus  MDC and MDIO  lines:
#
#     Recall that MDIO needs a pull-up resistor.
#

NET  'Phys_U22_MDC'     U22-36
NET  'Phys_U22_MDIO'    U22-37   R1967-1
NET  'Phys_U22_DVDDH'            R1967-2




#
#   Define the Phys U22  RESET  and  Interrupt  lines:
#

NET  'Phys_Chips_RESET_B'   U22-42

NET  'Phys_U22_INT_B'       U22-38




#
#   Define the  4 Pairs of  BASE-T  signals to/from Phys U22
#
#     Note from U22 these BASE_T pairs connect to
#          coupling capacitors and then to Switch B.
#

NET  'Phys_U22_TXRX_A_DIR'   U22-2
NET  'Phys_U22_TXRX_A_CMP'   U22-3

NET  'Phys_U22_TXRX_B_DIR'   U22-5
NET  'Phys_U22_TXRX_B_CMP'   U22-6

NET  'Phys_U22_TXRX_C_DIR'   U22-7
NET  'Phys_U22_TXRX_C_CMP'   U22-8

NET  'Phys_U22_TXRX_D_DIR'   U22-10
NET  'Phys_U22_TXRX_D_CMP'   U22-11