Nine things you
cannot see,
one page each 看不见的那几样，
一页画一样

From one row of switches to a whole chip, and on to how a keystroke reaches a wire. No hardware background needed on any of the nine — about four minutes a page. 从一排开关，到一颗芯片，再到你敲的一个字怎么走到线上。九页都不需要硬件基础，一页大约 4 分钟。

A sheet per thing. The one pulled out draws the chip on that board. 一样东西一张图纸。抽出来这张画的，就是板子上那颗芯片。

What is this set? 这九页是什么？

数据手册datasheet the manual a chip maker ships with the part — these nine pages have to match it 芯片厂随芯片一起给的说明书，这九页画的东西都要在它上面对得上

All nine hide inside the chip; the lid shows nothing. Each page opens with an analogy, then draws by the datasheet's rules. 这九样都藏在芯片里，壳上什么也看不见。每页先给一个日常比喻，再按手册的规矩画。

It's like…就像……

A hospital film. What you cannot see from outside is right there on the sheet, close enough to point at. 医院拍的片子。从外面看不见的东西，在片子上摆着，可以指着一样一样讲。

封起来的样子 as it comes, sealed 画开的样子 the same part, drawn open 外面只有印字 printing, and nothing else 一排开关、一条街、一段拍子 a switch row, a street, a beat
The lid carries printing and nothing else — every part on the right is drawn, not photographed. That is what these nine pages are. 壳上只有印字，别的什么都看不到——右边那一样一样都是画出来的，不是拍出来的。这九页就是这么来的。

Nine pages, one question each 九页，各答一个问题

The first four stay inside the chip; the next three cross to a second one — two chips, two peers, two address books; then one walks from a keystroke to a wire, and the last is about finding things fast. No fixed order, start where you like. 前四页在芯片里面，接下来三页跨到芯片之间——两块芯片、两侧对等、两本门牌；再往后一页从你敲的键走到线上，最后一页讲一个找东西的办法。顺序不锁，挑你现在想懂的那一页。

7 0
Registers寄存器 — a row of switches on the chip: one slot, one job.——芯片上的一排开关，一格管一件事。
SCLK
Timing时序 — two chips on four wires, one bit per beat.——两块芯片用四根线说话，一拍送一位。
The SoC一颗芯片 — inside, a city on one main road.——里面像一座城，一条主干道串起各家。
Two books两本门牌 — one wire between two chips, and two sets of numbers that never merge.——两块芯片之间一根线，两套门牌号从不合并。
No line there那条线不存在 — layered protocols look like peers talking sideways; only the bottom layer has a wire.——分层协议看着像同层在对话，真线只有最底下一根。
Two plates两块门牌 — the module is one continuous stretch; the system sees it split and the covered part re-numbered.——内存条是连续一条，系统看到的却被切开，盖住的那段换了号。
IP coresIP core — how a block that plugs onto the road is built.——一块能接上主干道的积木，怎么设计出来。
The kernel path内核路径 — how one keystroke reaches a serial pin.——你敲的一个字，怎么走到串口线上。
Halving对半砍 — twenty million cards, found in 25 flips.——2000 万张卡片，25 次就能翻到那一张。

The drawing language itself lives in the demo and the picture gallery. 这套画法本身在 demo 和 图解集 里。