Atmel SAM4S Series, Preliminary Data Sheet

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11100B–ATARM–31-Jul-12
SAM4S Series [Preliminary]
6. Input/Output Lines
The SAM4S has several kinds of input/output (I/O) lines such as general purpose I/Os (GPIO)
and system I/Os. GPIOs can have alternate functionality due to multiplexing capabilities of the
PIO controllers. The same PIO line can be used whether in I/O mode or by the multiplexed
peripheral. System I/Os include pins such as test pins, oscillators, erase or analog inputs.
6.1 General Purpose I/O Lines
GPIO Lines are managed by PIO Controllers. All I/Os have several input or output modes such
as pull-up or pull-down, input Schmitt triggers, multi-drive (open-drain), glitch filters, debouncing
or input change interrupt. Programming of these modes is performed independently for each I/O
line through the PIO controller user interface. For more details, refer to the product “PIO Control-
ler” section.
The input/output buffers of the PIO lines are supplied through VDDIO power supply rail.
The SAM4S embeds high speed pads able to handle up to 70 MHz for HSMCI (MCK/2), 70 MHz
for SPI clock lines and 46 MHz on other lines. See the “AC Characteristics” sub-section of the
product Electrical Characteristics. Typical pull-up and pull-down value is 100 k
Ω
for all I/Os.
Each I/O line also embeds an ODT (On-Die Termination), (see Figure 6-1 below). It consists of
an internal series resistor termination scheme for impedance matching between the driver out-
put (SAM4S) and the PCB trace impedance preventing signal reflection. The series resistor
helps to reduce IOs switching current (di/dt) thereby reducing in turn, EMI. It also decreases
overshoot and undershoot (ringing) due to inductance of interconnect between devices or
between boards. In conclusion ODT helps diminish signal integrity issues.
Figure 6-1. On-Die Termination
6.2 System I/O Lines
System I/O lines are pins used by oscillators, test mode, reset and JTAG to name but a few.
Described below in
Table 6-1 are the SAM4S system I/O lines shared with PIO lines.
These pins are software configurable as general purpose I/O or system pins. At startup the
default function of these pins is always used.
PCB Trace
Z0 ~ 50 Ohms
Receiver
SAM4 Driver with
Rodt
Zout ~ 10 Ohms
Z0 ~ Zout + Rodt
ODT
36 Ohms Typ.