RTM-ATCA-SXXX Overview
6806800H62B ATCA‐S201InstallationandUseGuide115
Table 52 Connector J33, PCIe and Miscellaneous RTM Signal Descriptions
PETx… PCI-Express transmit differential pair signals
PERx… PCI-Express receive differential pair signals
FCLKA 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.
PCIRST# 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# 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.
PCICFG# 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.
PS0# 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.
ENABLE# 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.
JTAG_xxx 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.
I2C_xxx This bus allows an RTM to place peripherals on the ATCA serial management bus.
10.2.4.3 Connector 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
).
