m21330 Mindspeed Technologies, m21330 Datasheet - Page 21

• Manufacturer Part Number: m21330
• Description: 4.25 Gbps Quad-channel Cable Driver And Adaptive Equalizer With 4x4 Crosspoint Switch
• Manufacturer: Mindspeed Technologies

5.1
The M21330 includes three distinct power supply domains: VDDCORE, AVDDIO, and DVDDIO.
VDDCORE powers the analog and digital core circuitry in the device, and must be set to 1.2V.
AVDDIO powers the input/output circuits in the device, and can be set to either 1.2V or 1.8V. Note that to achieve
output swing levels higher than 800 mVppd, AVDDIO must be set to 1.8V.
DVDDIO powers the digital circuitry within the device, and can be set to 2.5V or 3.3V to allow for interface with
various external digital devices. It is recommended that DVDDIO is connected to the same voltage level as any
digital devices that are used to control the M21330.
There are no power supply sequencing requirements for VDDCORE, AVDDIO, or DVDDIO in the M21330. When
the M21330 is operated in memory interface control (MIC) mode, the external EEPROM must be powered-up and
stable before the M21330 is powered-up to ensure that the automatic register download occurs without errors.
5.2
The M21330 contains a series of multifunction pins, whose functionality changes depending on the control mode
configuration of the device. Each multifunction pin is designed to support three different logic levels, high, low, and
floating state. The floating state logic level is achieved by floating the pin, connecting it to a high impedance source,
or driving to a voltage equal to DVDDIO/2. The table below summarizes the functionality of the multifunction pins
(MF[2:0]) for each control mode. More details on the functionality of the MF pins are included in the description
sections for each control mode.
Table 5-1.
5.3
The input buffers in the M21330 are designed to work with AC coupled input signals, and support operation with a
wide range of AC coupling capacitor values. Applications that use PRBS and/or 8b/10b encoded data will typically
use AC coupling capacitors with a value of 0.1 µF. SDI video applications will typically use AC coupling capacitors
with a value of 4.7 µF or larger. The output buffers are designed with PCML logic, and can operate with either AC
coupled or DC coupled systems. Register 03h can be used to enable/power-down the input buffers and also select
the desired input termination for each channel. The input buffer should not be configured in a high-impedance state
when data needs to be passed through the M21330. For typical operation, the input buffer should be enabled with
a 50Ω single ended (100Ω differential) termination.
21330-DSH-001-B
MF0
MF1
MF2
Pin
Multifunction Pins
Power Supply
Multifunction Pins
Input and Output Buffers
Functionality in Software/Memory
Memory Interface Control enable
Interface Control Mode
SDA
SCL
Mindspeed Technologies
Functionality in JTAG/Boundary Scan Mode
®
TCLK
TMS
F
Functional Description
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