Broadcom 96 Series User Manual

Broadcom 96xx User Guide Broadcom
®
96xx PCIe 4.0, 24G SAS MegaRAID
™
and eHBA Tri-Mode Storage Adapters
Table 12: Sideband Signal Pinout
Connector
A Side
Connector
B Side
Sideband or Vendor
Specific Pin Number
UBM Assignments Direction Resistor Value
A8 A26 7 BP_TYPE Input 100-kΩ pull-down
A9 A27 4 2W_RESET# Output 2.0-kΩ pull-up
A10 A28 3 GND — —
A11 A29 + REFCLK+ Output —
A12 A30 – REFCLK- Output —
B8 B26 0 2W_CLK Input/Output 2.0-kΩ pull-up
B9 B27 1 2W_DATA Input/Output 2.0-kΩ pull-up
B10 B28 2 GND — —
B11 B29 5 PERST# Input/Output 2.0-kΩ pull-up
B12 B30 6 C_TYPE, D_INPL#, CHANGE_DET# Input/Output 10-kΩ pull-up
The following table describes the sideband signal pin settings.
Table 13: Sideband Management Pin Settings
Pin Name Settings Description
BP_TYPE
•
0: SGPIO
•
1: Two-wire interface
Indicates if the backplane uses SGPIO or two-wire interface for management.
To maintain backwards compatibility with SPGIO-based backplanes, the adapter has
a weak pull-down to default to SGPIO if the backplane does not explicitly drive the
signal.
2W_RESET#
•
0: Reset is asserted
•
1: Reset is not asserted
Optional reset driven by the host if the UBM target reports that the target can be
reset.
REFCLK+/- — PCIe REFCLK HCSL 100-MHz clock driven by the device side ports to PCIe devices
that require REFCLK.
If D_INPL# is 0 and BP_TYPE is 1, the adapter enables the REFCLK outputs for that
quad of high-speed lanes.
When BP_TYPE is 0 or the UBM Clock Routing bit on the backplane is 0, this output
is turned off.
2W_CLK —
The two-wire interface clock signal.
2W_DATA —
The two-wire interface data signal.
PERST#
•
0: Reset is asserted
•
1: Reset is not asserted
The adapter drives the PCIe RESET# signal.
This signal uses a clamp to ground so that the signal on the adapter powers up LOW
until backplane detection warrants the release of this signal for open-drain use. This
method ensures that PERST# does not deassert until the directly connected NVMe
drive is successfully detected.
Broadcom 96xx-MR-HBA-Tri-Mode-UG108
18

Broadcom 96 Series Specifications

General

Brand	Broadcom
Model	96 Series
Category	Adapter
Language	English