Emerson ATCA-S201 manual 6806800H62B ATCA‐S201 Installation and Use Guide 115

RTM-ATCA-SXXX Overview

Table 52 Connector J33, PCIe and Miscellaneous RTM Signal Descriptions

PETx…

PERx…

FCLKA

PCIRST#

RTM#

PCICFG#

PS0#

ENABLE#

JTAG_xxx

I2C_xxx

PCI-Express transmit differential pair signals PCI-Express receive differential pair signals

Fabric clock, as defined in AMC.0 specification. Intended to be used for PCI-Express 100MHz spread spectrum clock. This signal can be either terminated or passed through the CREFCLK via jumpers on the RTM403. The ATCA blade provides no spread spectrum support.

PCI-Express reset signal (input). The ATCA board may drive a Logic low to reset PCI-Express switch and PCI-Express interfaces that are behind it.

RTM# signal is grounded by the ATCA-S201 to indicate a MMC controller is present (see AMC.0 specification.) The ATCA implementation shall include a 10Kohm pull-up resistor to management power on the ATCA. In this way, an ATCA is able to detect non-intelligent vs. intelligent RTMs.

PCI-Express bus configuration signal. It shall be grounded on RTMs that use a single x8 PCI- Express bus and pulled up on the ATCA with 10Kohm resistor to management power. On RTMs that expect two x4 PCI-Express busses this pin will float (not be connected). Two x4 PCI Express busses are intended for RTM implementations that desire to avoid PCI-Express switch in order to reduce latency. The ATCA-S201 asserts logic ground to this signal.

Active low RTM present signal.PS0# is tied to logic GND on the ATCA blade. PS0# (Connector J33) and PS1# (Connector J30) shall be connected through a diode on the ATCA-S201, exactly as defined in AMC.0 specification. PS1# is last mate on Power connector and PS0# is on the opposite end of the set of connectors. Logic low on PS1# indicates that RTM is present and fully inserted.

When low indicates to RTM that it is fully inserted and that MMC can start execution. Logic high shall keep MMC in reset state. This signal shall have a pull-up resistor as indicated in AMC.0 specification.

These pins provide a functional JTAG port on the P33 connector. The JTAG chain is for mfg testing only and the chain is not intended for RTM use.

This bus allows an RTM to place peripherals on the ATCA serial management bus.

10.2.4.3Connector J30, Power Supply for RTM

The ATCA-S201 supplies 12 V and the 3.3 V stand-by voltages to an advanced rear transition modules (RTM) via the P30 connector. The P30 connector assignments also include the IPMI-L interface, PS1#. If needed, an advanced RTM will convert the main 12V payload power into 1.2V, 1.5V, 2.5V and 3.3V by using DCDC converters.

The ATCA-S201 is specified to the following maximum power ratings:

Mean power: 25 W

Peak power: 26 W

Standard deviation of power from mean power: 0.25 W

The ATCA-S201 P30 connector is implemented by using Metral® 89096-xxx from FCI (www.fciconnect.com).

6806800H62B ATCA‐S201 Installation and Use Guide 115