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Power Control
Overview
The GTP_DUAL tiles support a range of power control modes. These modes support both
generic power management capabilities as well as those defined in the PCI Express and
SATA standards.
Ports and Attributes
Table 5-9
Table 5-9: Power Ports
Port
CLKIN
PLLPOWERDOWN
REFCLKPWRDNB
RXPOWERDOWN0[1:0]
RXPOWERDOWN1[1:0]
TXDETECTRX0
TXDETECTRX1
TXELECIDLE0
TXELECIDLE1
TXPOWERDOWN0[1:0]
TXPOWERDOWN1[1:0]
Notes:
1. Because of the shared PMA PLL, a powerdown via PLLPOWERDOWN or REFCLKPWRDNB affects both channels.
Virtex-5 RocketIO GTP Transceiver User Guide
UG196 (v1.3) May 25, 2007
defines the power ports.
Dir
Domain
Reference clock input to the shared PMA PLL. The CLKIN rate in
In
N/A
conjunction with CLK25_DIVIDER determines the timing PCIe
powerdown state transitions.
Powers down the shared PMA PLL:
In
Async
0: Shared PMA PLL is powered up
1: Shared PMA PLL is powered down
Powers down the GTP reference clock circuit:
In
Async
0: Reference clock circuit is powered down
1: Reference clock circuit is powered up
Powers down the RX lanes. The encoding complies with the PCI
Express encoding. TX and RX can be powered down separately,
however, for PCI Express compliance, TXPOWERDOWN and
RXPOWERDOWN have to be used together.
00: P0 (normal operation)
In
Async
01: P0s (low recovery time powerdown)
10: P1 (longer recovery time; RecDet is still on)
11: P2 (lowest power state) In the P2 powerstate, RXRECCLK
of this GTP transceiver is indeterminate, it is either a static 1 or
a static 0.
Activates the receive detection sequence. The sequence ends when
In
TXUSRCLK2
PHYSTATUS is asserted to indicate that the results of the test are
ready on RXSTATUS.
Drives TXN and TXP to the same voltage to perform PCI Express
In
TXUSRCLK2
electrical idle/beaconing
Powers down the TX lanes. The encoding complies with the PCI
Express encoding. TX and RX can be powered down separately,
however, for PCI Express compliance, TXPOWERDOWN and
RXPOWERDOWN have to be used together.
In
Async
00: P0 (normal operation)
01: P0s (low recovery time powerdown)
10: P1 (longer recovery time; RecDet is still on)
11: P2 (lowest power state)
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Power Control
Description
81
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