MPC8548E Freescale, MPC8548E Datasheet - Page 60

• Manufacturer Part Number: MPC8548E
• Description: Integrated Processor
• Manufacturer: Freescale

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High-Speed Serial Interfaces (HSSI)
15 High-Speed Serial Interfaces (HSSI)
The MPC8548E features one Serializer/Deserializer (SerDes) interface to be used for high-speed serial
interconnect applications. The SerDes interface can be used for PCI Express and/or serial RapidIO data
transfers.
This section describes the common portion of SerDes DC electrical specifications, which is the DC
requirement for SerDes reference clocks. The SerDes data lane’s transmitter and receiver reference circuits
are also shown.
15.1
The SerDes utilizes differential signaling to transfer data across the serial link. This section defines terms
used in the description and specification of differential signals.
Figure 38
description. The figure shows a waveform for either a transmitter output (SD_TX and SD_TX) or a
receiver input (SD_RX and SD_RX). Each signal swings between A volts and B volts where A > B.
Using this waveform, the definitions are as follows. To simplify the illustration, the following definitions
assume that the SerDes transmitter and receiver operate in a fully symmetrical differential signaling
environment.
60
HRESET to PCI-X initialization pattern hold time
Notes:
1. See the timing measurement conditions in the PCI-X 1.0a Specification .
2. Minimum times are measured at the package pin (not the test point). Maximum times are measured with the test point and
3. Setup time for point-to-point signals applies to REQ and GNT only. All other signals are bused.
4. For purposes of active/float timing measurements, the Hi-Z or off state is defined to be when the total current delivered
5. Setup time applies only when the device is not driving the pin. Devices cannot drive and receive signals at the same time.
6. Maximum value is also limited by delay to the first transaction (time for HRESET high to first configuration access, t
7. A PCI-X device is permitted to have the minimum values shown for t
8. Device must meet this specification independent of how many outputs switch simultaneously.
9. The timing parameter t
10.The timing parameter t
11.Guaranteed by characterization.
11.Guaranteed by design.
load circuit.
through the component pin is less than or equal to the leakage current specification.
The PCI-X initialization pattern control signals after the rising edge of HRESET must be negated no later than two clocks
before the first FRAME and must be floated no later than one clock before FRAME is asserted.
mode, the device must meet the requirements specified in PCI 2.2 for the appropriate clock frequency.
Specification.
1. Single-ended swing
Signal Terms Definition
shows how the signals are defined. For illustration purpose, only one SerDes lane is used for the
MPC8548E PowerQUICC™ III Integrated Processor Hardware Specifications, Rev. 4
Table 49. PCI-X AC Timing Specifications at 133 MHz (continued)
Parameter
PCIVKH
PCRHFV
is a minimum of 1.4 ns rather than the minimum of 1.2 ns in the PCI-X 1.0a Specification.
is a minimum of 10 clocks rather than the minimum of 5 clocks in the PCI-X 1.0a
Symbol
t
PCRHIX
PCKHOV
and t
Min
0
CYC
only in PCI-X mode. In conventional
Max
50
Freescale Semiconductor
Unit
ns
Notes
6, 12
PCRHFV
).