Entity: Gtx7TxRst

Diagram

time TPD_G string GT_TYPE integer range 4 to 20 STABLE_CLOCK_PERIOD integer range 2 to 8 RETRY_COUNTER_BITWIDTH std_logic STABLE_CLOCK std_logic TXUSERCLK std_logic SOFT_RESET std_logic PLLREFCLKLOST std_logic PLLLOCK std_logic TXRESETDONE std_logic MMCM_LOCK std_logic PHALIGNMENT_DONE std_logic GTTXRESET std_logic MMCM_RESET std_logic PLL_RESET std_logic TX_FSM_RESET_DONE std_logic TXUSERRDY std_logic RUN_PHALIGNMENT std_logic RESET_PHALIGNMENT std_logic_vector (RETRY_COUNTER_BITWIDTH-1 downto 0) RETRY_COUNTER

Description

//////////////////////////////////////////////////////////////////////////////// // _ // / /\/ / // // \ / Vendor: Xilinx // \ \ \/ Version : 2.2 // \ \ Application : 7 Series FPGAs Transceivers Wizard // / / Filename :Gtx7TxRst.vhd // // /\ // \ \ / \ // __\/___\ // // Description : This module performs TX reset and initialization.

Module Gtx7TxRst Generated by Xilinx 7 Series FPGAs Transceivers Wizard

(c) Copyright 2010-2012 Xilinx, Inc. All rights reserved.

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Generics

Generic name Type Value Description
TPD_G time 1 ns
GT_TYPE string "GTX"
STABLE_CLOCK_PERIOD integer range 4 to 20 8 Period of the stable clock driving this state-machine, unit is [ns]
RETRY_COUNTER_BITWIDTH integer range 2 to 8 8

Ports

Port name Direction Type Description
STABLE_CLOCK in std_logic Stable Clock, either a stable clock from the PCB
TXUSERCLK in std_logic TXUSERCLK as used in the design
SOFT_RESET in std_logic User Reset, can be pulled any time
PLLREFCLKLOST in std_logic PLL Reference-clock for the GT is lost
PLLLOCK in std_logic Lock Detect from the PLL of the GT
TXRESETDONE in std_logic
MMCM_LOCK in std_logic
GTTXRESET out std_logic
MMCM_RESET out std_logic
PLL_RESET out std_logic Reset PLL
TX_FSM_RESET_DONE out std_logic Reset-sequence has sucessfully been finished.
TXUSERRDY out std_logic
RUN_PHALIGNMENT out std_logic
RESET_PHALIGNMENT out std_logic
PHALIGNMENT_DONE in std_logic
RETRY_COUNTER out std_logic_vector (RETRY_COUNTER_BITWIDTH-1 downto 0) Number of

Signals

Name Type Description
tx_state tx_rst_fsm_type
soft_reset_sync std_logic
soft_reset_rise std_logic
soft_reset_fall std_logic
init_wait_count integer range 0 to WAIT_MAX
init_wait_done std_logic
pll_reset_asserted std_logic
tx_fsm_reset_done_int std_logic
tx_fsm_reset_done_int_s3 std_logic
txresetdone_s3 std_logic
retry_counter_int integer range 0 to MAX_RETRIES
time_out_counter integer range 0 to WAIT_TIMEOUT_2ms
reset_time_out std_logic
time_out_2ms std_logic \Flags that the various time-out points
time_tlock_max std_logic
time_out_500us std_logic /
mmcm_lock_count integer range 0 to MMCM_LOCK_CNT_MAX-1
mmcm_lock_int std_logic
mmcm_lock_reclocked std_logic_vector(3 downto 0)
run_phase_alignment_int std_logic
run_phase_alignment_int_s3 std_logic
wait_bypass_count integer range 0 to MAX_WAIT_BYPASS-1
time_out_wait_bypass std_logic
time_out_wait_bypass_s3 std_logic
refclk_lost std_logic
plllock_sync std_logic

Constants

Name Type Value Description
MMCM_LOCK_CNT_MAX integer 1024
STARTUP_DELAY integer 500 AR43482: Transceiver needs to wait for 500 ns after configuration
WAIT_CYCLES integer STARTUP_DELAY / STABLE_CLOCK_PERIOD Number of Clock-Cycles to wait after configuration
WAIT_MAX integer WAIT_CYCLES + 10 500 ns plus some additional margin
WAIT_TIMEOUT_2ms integer 2000000 / STABLE_CLOCK_PERIOD 2 ms time-out
WAIT_TLOCK_MAX integer 100000 / STABLE_CLOCK_PERIOD 100 us time-out
WAIT_TIMEOUT_500us integer 500000 / STABLE_CLOCK_PERIOD 100 us time-out
MAX_RETRIES integer 2**RETRY_COUNTER_BITWIDTH-1
MAX_WAIT_BYPASS integer 110000 110000 TXUSRCLK cycles is the max time for Multi lane designs

Types

Name Type Description
tx_rst_fsm_type ( INIT,
ASSERT_ALL_RESETS,
RELEASE_PLL_RESET,
RELEASE_MMCM_RESET,
WAIT_RESET_DONE,
DO_PHASE_ALIGNMENT,
RESET_FSM_DONE)

Processes

Description
FSM for resetting the GTX/GTH/GTP in the 7-series. ~~~~~~~~~~
Following steps are performed: 1) Only for GTX - After configuration wait for approximately 500 ns as specified in answer-record 43482 2) Assert all resets on the GT and on an MMCM potentially connected. After that wait until a reference-clock has been detected. 3) Release the reset to the GT and wait until the GT-PLL has locked. 4) Release the MMCM-reset and wait until the MMCM has signalled lock. Also signal to the RX-side which PLL has been reset. 5) Wait for the RESET_DONE-signal from the GT. 6) Signal to start the phase-alignment procedure and wait for it to finish. 7) Reset-sequence has successfully run through. Signal this to the rest of the design by asserting TX_FSM_RESET_DONE.

Instantiations

Description
Clock Domain Crossing

State machines

  • FSM for resetting the GTX/GTH/GTP in the 7-series.

~~~~~~~~~~

Following steps are performed:

1) Only for GTX - After configuration wait for approximately 500 ns as specified in

answer-record 43482

2) Assert all resets on the GT and on an MMCM potentially connected.

After that wait until a reference-clock has been detected.

3) Release the reset to the GT and wait until the GT-PLL has locked.

4) Release the MMCM-reset and wait until the MMCM has signalled lock.

Also signal to the RX-side which PLL has been reset.

5) Wait for the RESET_DONE-signal from the GT.

6) Signal to start the phase-alignment procedure and wait for it to

finish.

7) Reset-sequence has successfully run through. Signal this to the

rest of the design by asserting TX_FSM_RESET_DONE.
state transitions cluster_tx_state tx_state INIT INIT ASSERT_ALL_RESETS ASSERT_ALL_RESETS INIT->ASSERT_ALL_RESETS init_wait_done = '1'    RELEASE_PLL_RESET RELEASE_PLL_RESET ASSERT_ALL_RESETS->RELEASE_PLL_RESET PLLREFCLKLOST = '0' and pll_reset_asserted = '1'    RELEASE_PLL_RESET->ASSERT_ALL_RESETS time_out_2ms = '1'    RELEASE_MMCM_RESET RELEASE_MMCM_RESET RELEASE_PLL_RESET->RELEASE_MMCM_RESET plllock_sync = '1'    RELEASE_MMCM_RESET->ASSERT_ALL_RESETS time_tlock_max = '1' and mmcm_lock_reclocked(0) = '0'    WAIT_RESET_DONE WAIT_RESET_DONE RELEASE_MMCM_RESET->WAIT_RESET_DONE mmcm_lock_reclocked(0) = '1'    WAIT_RESET_DONE->ASSERT_ALL_RESETS time_out_500us = '1'    DO_PHASE_ALIGNMENT DO_PHASE_ALIGNMENT WAIT_RESET_DONE->DO_PHASE_ALIGNMENT txresetdone_s3 = '1'    DO_PHASE_ALIGNMENT->ASSERT_ALL_RESETS time_out_wait_bypass_s3 = '1'    RESET_FSM_DONE RESET_FSM_DONE DO_PHASE_ALIGNMENT->RESET_FSM_DONE PHALIGNMENT_DONE = '1'